TA AFTER ACTION REPORT IRON MOUNTAIN
DEPARTMENT OF THE ARMY
Headquarter, 11th Infantry Brigade, 23d Infantry Division
APO San Francisco 96217
SUBJECT: 11th Brigade combat Operations after Action Report
TO: Commanding General
23d Infantry Division
ATTN: AVDF-GCHL
APO 96374
1. (C) NAME OF OPERATION: IRON MOUNTAIN (Phases I, II, III).
2. (C) DATES OF OPERATION: 282400 Feb 1969 to 282400 Feb 1971.
3. (C) LOCATION: Quang Ngai Province from the Song Tra Khuc River South to the MR I/ MR II boundary, 1:50,000, series L7014, sheets 6638, I; 6639, II; 6739, II, III; 6738, I, II, III, IV; and 6838, III, IV.
4. (C) COMMAND HEADQUARTERS: 11th Infantry Brigade, APO San Francisco 96217
5. (C) REPORTING HEADQUARTERS: Col Warner S. Goodwin JR, Commanding Officer, 11th Infantry Brigade, APO San Francisco 96217. Brigade Commanders During Reporting Period:
Col. John Donaldson to 27 Mar 69
Col. Jack L Treadwell 28 Mar 69 to 17 Sept 69
Col. Hugh F. T. Hoffman 18 Sept 69 to 27 Mar 70
Col. Kendrick B. Barlow 27 Mar 70 to 11 Sept 70
Col. John L. Insani 11 Sept 70 to 1 Mar 71
6. ( C ) TASK ORGANIZATION:
Phase I (28 Feb 69 to 10 Aug 69)
11th Inf Bde Con.
HHC, 11th Inf Bde 3-1 Inf
6-11 Arty (DS) A/3-1
C-26th Engr (DS) B/3-1
1- 23d MP Co C/3-1
3/B-523d Signal Bn D/3-1
Det 1 328th RR E/3-1
TM 1 635th MI Det 1/E-1-1 Cav
90th Chem Det Sqd/C-26th Engr (DS)
A-23d S&T Bn D/6-11 Arty (DS)
B/723D Maint Bn
59th Inf Plt (Scout Dog)
B-23d Med Bn
4-3 Inf 4-21 Inf
A/4-3 A/4-21
B/4-3 B/4-21
C/4-3 C/4-21
D/4-3 D/4-21
E/4-3 E/4-21
D/6-11 Arty (DS) 3/E-1-1 Cav
Sqd/C/26th Engr (DS)
1-20 Inf A/6-11 Arty (DS)
A/1-20
B/1-20 1-1 Cav (23 Aug 69- Sept 69)
D/1-20 C/1-1
E/1-20 D/1-1
Sqd/c-26th Engr (DS) C/4-3 (OPCON)
C/6-11 Arty (DS)
Phase II (11 Aug 69 to 01 May 70)
11th Inf BDE Con 1-20 Inf
HHC 11th Inf Bde A/1-20
6-11 Arty (DS) B/1-20
C-26th Engr (DS) C/1-20
1-26d MP Co D/1-20
3/B-523d Signal Bn E/1-20
Det 1, 328th RR Sqd/C-26th Engr (DS)
TM 1, 635th MI Det C/6-11 Arty
90th Chem Det
A-23d S&T Bn 4-21Inf
B-723d Maint Bn A/4-21
59th Inf Plt (Scout Dog) B/4-21
B-23d Med Bn C/4-21
D/4-21
3-1 Inf E/4-21
A/3-1 3/E-1-1 Cav
B/3-1 Sqd/C-26th Engr (DS)
C/3-1 A/6-11 Arty (DS)
D/3-1 A/1-1 Cav (OPCON)
E/3-1 E/1st Cav (OPCON)
1/E-1-1 Cav A/3-1 (OPCON)
Sqd/C-26th Engr (DS)
D/6-11 Arty (DS) 1-1 Cav 9 23 Aug 69-9 Sep 69 )
A/1-1
4-3 Inf C/1-1
A/4-3 D/1-1
B/4-3 C/4-3 (OPCON)
C/4-3
D/4-3
E/4-3
B/6-11 Arty ( DS)
Phase III (02 May 70 to 26 Feb 71)
11th Inf Bde Con 1-20 Inf
HHC, 11th Inf Bde A/1-20
6-11 Arty (DS) B/1-20
C/26th Engr (DS) C/1-20
1-23 MP Co D/1-20
3/B-523d Signal Bn E/1-20
Det 1, 328th RR Sqd/c-26th Engr (DS)
Tm 1, 635th MI Det C/6-11 Arty (DS)
90th Chem Det
A/23d S&T Bn 4-21 Inf
B-723d Maint Bn A/4-21
59th Inf Plt (Scout Dog ) B/4-21
B-23d Med Bn C/4-21
D/4-21
3-1 Inf E/4-21
A/3-1 3/E-1-1 Cav
B/3-1 Sqd/C-26th Engr (DS)
C/3-1 A/6-11 Arty (DS)
D/3-1 E/1-1 Cav (OPCON)
E/3-1
Sqd/C-26th Engr (DS) 1-1 Cav (23 Aug 69 to 9 Sept 69)
D/6-11 Arty (DS) A/1-1
B/1-1 Cav (OPCON) C/1-1
E/1-1 Cav (OPCON) D/1-1
C/4-3 (OPCON)
4-3 Inf
A/4-3
B/4-3
C/4-3
D/4-3
E/4-3
B/6-11 Arty (DS)
7. ( C ) SUPPORTING FORCES:
Phase I (28 Feb 69 to 10 Aug 69)
B/1-82 Arty (155mm) 14th Avn Bn
C/1-82 Arty (155mm) B-123 Avn Co (Aero Scouts)
C/3-18 Arty (8 in SP) 20th Tactical Aerial Support Squadron
A/1-82 Arty (155mm) (Helix)
D/1-14 Arty (105mm) 7th Air Force
1-11 Arty (GS-R) 7th Psychological Operations Bn
9th Special Operations Squadron
B/1-82 Arty (155mm)
C/1-82 Arty (155mm)
C/3-18 Arty (8 In SP)
A/1-82 Arty (155mm)
D/1-14 Arty (105)
1-11 Arty (GS-R)
14th Avn Bn
B-123d Avn (Aerial Scouts)
20th Tactical Aerial Support Squadron (Helix)
7th Air Force
7th Psychological Operations Bn
9th Special Operations Squadron
B-9th Engr Bn (USMC), (Land Clearing Operations)
G-55 Arty (Quad .50)
3/G-29th Arty (Xenon searchlight sections attached to Quad 50 sections)
271t FA Det (Ground Surveillance, An/TPS-25)
251st FA Det (Countermortar, AN/MP Q-4)
Div Arty Radar section (AN/TPS-25)
Metro section 2-11th Arty, 101st Airborne Division (AMBL) (OPCON)
Phase III (02 May 70 to 22 Feb 71)
B/1-82 Arty (155mm)
C/1-82 Arty (155mm)
C/3-18 Arty (8 in SP)
A/1-82 Arty (155mm)
D/1-14 Arty (105mm)
1-11 Arty (GS-R)
14th Avn Bn
D-123d Avn Co (Aero Scouts)
20th Tactical Aerial Support Squadron (Helix)
7th Air Force
7th Psychological Operations Bn
9th Special Operation Squadron
B-9th Engr Bn (USMC), (Land Clearing Operations)
G-55 Arty (Quad .50)
271st FA Det (Ground Surveillance, (AN/TPS-25)
251st FA Det (Countermortar, AN/MP Q-4)
Div Arty Radar Section (AN/TPS-25)
Metro section, 2-11 Arty, 101st Airborne Division (AMBL) (OPCON
8. (C) INTELLIGENCE: See Annex A, (Includes S-5 After Action Report).
9. (C) MISSION: To conduct unilateral and combined operations with ARVN and provincial forces to find, fix and destroy enemy main force and local force units in the 11th Bde TAOR and TAOI and to interdict enemy supply and communication lines. The 11th Inf Bde also actively supported the GVN Pacification and Revolutionary Development Program.
10. (C) CONCEPT OF THE OPERATION:
11. ( C ) EXECUTION:
Phase I (highlights):
15 Mar 69:
C/3-1 at BS795428 engaged an unknown size enemy force resulting in 2 US KIA, 14 US WIA, 31 NVA KIA, CIA 9 AK-47’S, 1 m-72 Law, 1 M-16 rifle, 2 RPG’s, and 2 RPD machine guns.
29 Mar 69:
C/3-1 made contact at BS794483 with a company size NVA force resulting in 3 US, KIA, 7 US WIA, and 11 NVA KIA.
12 May 69:
At 1000hrs C/3-1 made contact with a battalion size NVA force at BS8314** with 1/E/1-1 Cav, B/3-1, and D/3-1 brought in to assist, the contact was maintained throughout the day. Results: 10 US KIA, 43 US WIA, 61 NVA KIA, CIA 3 AK-47’s, 2 RPD light machine guns, and 1 7.92mm Heavy Machine gun.
31 May 69:
C/1-20 made contact with an unknown size enemy force in a fortified complex. Reinforced by D/1-20, Recon 1-20, and E/1-1 Cav, the company pushed the enemy force from his positions and killed 29 NVA and captured 1 82mm mortar, 1 .30caliber machine gun, and 5 AK-47’s. There were 4 US KIA, and 13 US WIA.
3 June 69:
D/1-20 made contact with an NVA force firing RPG’s and automatic weapons. C/1-20, 1/E/1-1 Cav and D/4-3 were brought in to assist company D in fighting which lasted until just after dark. Results were 8 US KIA, 24 US WIA, 12 NVA KIA, CIA 1 57mm recoilless rifle, 1 30-caliber machine gun, and 5 AK-47’s.
4 June 69:
While on patrol vicinity BS900303, 1/D/3-1 and 1/E/1-1 Cav made contact with an estimated enemy platoon. Results: 2 US KIA, 2 US WIA, 12 NVA KIA, CIA 3 AK-47’s, and 1 RPG Launcher.
7 June 69:
During the evening of 7 June and early morning on 8 June a sapper force attacked LZ LIZ. The defenders killed 12 NVA and captured 1 NVA, also capturing 2 RPG’s, 2 AK-47’s, 6 B-40 rockets, 60 Chicom hand grenades, and 3 bangalore torpedoes. There was 1 US KIA, and 5 US WIA.
9-10-11 June 69:
Recon 1-20 and A/1-20 made heavy contact with an unknown size enemy force on 9 June. It continued until dark when the NVA broke contact. D/1-20 was brought in to assist in the search for the withdrawing enemy. A/1-20 continued to make scattered contact with the enemy throughout the day and a helicopter was shot down in the late afternoon while trying to extract company A. D/1-20, securing the downed aircraft was subjected to continual attacks throughout the night, but held its position. The final results showed 6 US KIA, 13 US WIA, 68 NVA KIA, 9 crew-served weapons CIA, and 9 individual weapons CIA.
11 June 69:
Sappers attacked LZ LIZ again and the enemy penetrated the perimeter, but was thrown back by a reaction force. US losses were 1 US KIA, 7 US WIA, there were 14 NVA KIA, 1 NVA/CIA/WIA, and 3 AK-47’s, and 1 RPG captured.
13 June 69:
A /4-3 engaged an unknown size enemy force, resulting in 1 US KIA, 4 US WIA, 16 NVA KIA, CIA 4 AK-47’s and 1 M-79.
2 July 69:
A (-)/3-1 at BS834289 engaged an estimated NVA company resulting in 22 NVA KIA, CIA 4 AK-47’s and 3 RPG launchers.
19 July 69:
D/3-1 made contact with an unknown size enemy force. Reinforced by B/3-1 they had 14 NVA KIA, CIA 1 RPG, 1 RPD machine gun, and 3 AK-47’s. There were 4 US KIA and 16 US WIA.
3 Jan 70:
D/4-3 (OPCON 4-21) on the hill 285 at BS821286 came under a heavy mortar and ground attack from a battalion size force. Results were 7 US KIA, and 11 US WIA. Enemy results were 39 NVA KIA, CIS 10 AK-47’s, 1RPG, 75 chicom grenades, 1 9mm pistol, and 1 M-16 rifle.
21 April 70:
Recon 1-20 ran a cordon and search operation on 20-21 April with several contacts resulting. There were 15 VC KIA, 10 VC CIA, 3 AK-47’s, 3 SKS rifles, 1 M-1 carbine, 20 assorted Hand grenades, 1 VC flag, and several documents. The platoon also reported 5 VC KIA by Primo 4 and Shark 11, plus 1 VC WIA, 3 AK-47’s, 1 M-1 carbine, 1 M-16 rifle, 1 M-3 caliber .45 sub-machine gun, 7 M-26 hand grenades, 2 blue uniforms, medical supplies and documents were CIA.
8 May 70:
On the night of 7 May and early morning of 8 May, FSB 411 (3-1 Inf) was attacked by an unknown size enemy sapper force resulting in 10 VC KIA, 2 VC CIA, 54 homemade grenades, 42 chicom grenades, 11 B-40 rockets, 5 bangalore torpedoes, 5 satchel charges, 2 AK-47’s, 1 AK-50, and a 9mm pistol CIA. There were no friendly casualties.
3 Sept 70:
C/3-1 assisted by D/3-1 and E/1-1 Cav, engaged an unknown size enemy force resulting in 11 enemy KIA, 13 AK-47’s, 16 RPG’s, 1 pistol CIA. This occurred at BS561634.
22 Feb 71:
Reacting to an IOS sighting called in by C/1-20, Saber 40 (nighthawk gunship from D/1-1 Cav) engaged an unknown size enemy force resulting in 14 NVA KIA and 2 more NVA KBA. (Credit to C/6-11 Arty which fired artillery in the area). C/1-20 swept the area and found 8 AK-47’s, 1 RPG launcher, and other assorted equipment.
Summary:
The 11th Infantry Brigade’s combat operations during the Iron Mountain operational period were generally characterized by small unit contacts. As can be easily ascertained from the time periods for the major contacts during Iron Mountain, large-unit contacts grew increasingly rare after mid-1969. There were 10 such incidents during the period 28 February 69 to August 69, and only 5 from August 69 until the termination of the operation. Most enemy initiated incidents were either sniper or harassing in nature, or short attacks by fire. The enemy usually broke contact as quickly as possible.
12. ( C ) RESULTS:
Phase I (28 Feb 69 to 10 Aug 69)
ENEMY KIA 1,269
ENEMY CIA 322
HOI CHANH 45
Phase II ( 11 Aug 69 to 01 May 70 )
ENEMY KIA 1,130
ENEMY CIA 598
HOI CHANH 14
Phase III ( 02 May 70 to 28 Feb 71 )
EMENY KIA 1,152
ENEMY CIA 598
HOI CHANH 21
WEAPONS CAPTURED:
Phase I ( 28 Feb 69 to 10 Aug 69 )
IWC 284
CSWC 39
Phase II ( 11Aug 69 to 01 May 70 )
IWC 433
CSWC 21
Phase III ( May 70 to 28 Feb 71 )
IWC 445
CSWC 12
13. ( C) ADMINISTRATIVE MATTERS:
14. (C ) SPECIAL EQUIPMENT AND TECHNIQUES:
15. (C) Commander Analysis:
a. Operation by the 11th Infantry Brigade Maneuver Battalions during Iron Mountain were characterized by widely dispersed units utilizing saturation patrols and ambushes. Eagle flights were particularly effective in the low lands, especially when made with blocking forces on Key terrain. Another favorite tactic, which met with great success, was the block and sweep operations with U.S. and ARVN or provincial forces working together in combined effort. This was primarily effective, in flushing local VC and VCS from heavily populated areas. In addition, the employment of mechanical ambushes and snipers teams greatly extended the coverage of the AO along with squad saturation patrols and manned ambushes.
b. Another important facet of the 11th Brigade operations in it’s AO. Was rice denial and denial activities during periods of rice harvest. By denying the enemy his most important food source, the brigade forced him to either shorten his line of supply by withdrawal from forward areas, or to openly fight for food. These denial operations also aided the pacification program by providing protection to local villages from harassment during the rice harvest.
c. The weather had no effect on operations during the dry season. However from October through January, heavy rainfall and limit visibility hindered movement and restricted the use of war dogs and radar. Air Support with tactical and logistical, was also curtailed to a great extent by the monsoon rains and frequent ground fog.
d. Overall, the 11th Infantry Brigade’s mission changed little during the two years period of the Iron Mountain Operation. However, the success of the units operations during that period are demonstrated by the greatly reduced number of large-unit contacts and the success of the Pacification Program.
16. (C ) RECOMMENDATIONS:
Annex (Intelligence) to after Action Report Iron Mountain (Phase I, II, and III).
(U)
1. ( C) WEATHER AND TERRAIN:
2 ( C) PRELIMINARY INTELLIGENCE:
2. ( C) ORDER OF BATTLE:
a. General: The Quang Ngai Provincial Unit controls the enemy disposition in the 11th Brigade AO. The only NVA units that are subordinate to it are the 107th Heavy Weapons Battalion and the 40th Sapper Battalion. The other NVA units are working in conjunction with the unit but are not subordinate to it.
b. 21st Regiment: This unit has been a traditionally aggressive and hard fighting unit. It has attacked U.S. units in company and battalion size. They have been very active in the Nghia Hanh area, and have been in company and battalion size elements when engaged. The estimated strength is approximately one thousand men. The regiment has three battalions and each one is responsible for a particular AO. The regimental CP usually rotates between its tree battalions so it can keep abreast of the problems of its battalions and keep its location secret.
c. 403d NVA Sapper Battalion: the 403d Sapper Battalion is composed of three sapper companies and four support platoons. The 403d had been responsible for attacks on some U.S. and ARVN Out Posts in the AO. More recently the 403d Sapper Battalion. They are also engaged in rice gathering and a small amount of food production.
d. 406th Sapper Battalion: The 406th Sapper Battalion is located in the northwestern part of Quang Ngai Province. They have an estimated strength of two hundred and fifty men. They are targeted against ARVN out posts although they are believed to have taken part in attacks on the Out Post Warrier and other U.S. fire bases in early February 1971.
e. 40th Sapper Battalion: The 40th Sapper Battalion is a newly organized unit in comparison with the other units in the AO. It was formerly part of the 22d NVA Regiment and was reorganized in September 1970. They have been in a training mission with the 403d Sapper Battalion. They are believed to have taken part in the attack on Out Post Max in early February 1971.
f. 38th Battalion: The 38th Battalion is one of the oldest battalions in the 11th Brigade AO, and is one of the best. It has been a consistently aggressive unit. When it was formed it was only thirty percent NVA, it has risen to ninety percent. It was one of the units which overran Out Post Max in early February. Lately it has taken heavy casualties from the 4th ARVN Recon Company in two engagements.
g. 48th Battalion: The 48th Battalion has been operating in the northwestern part of the 11th Brigade AO. It is composed of three infantry companies. It has usually sought to avoid contact with U.S. forces and engaged the ARVN. However, it is believed to have assisted in the attack on U.S. Out Posts in early February 1971. It has been reported that it is now in a training phase and will soon begin new operations.
3. ( C) PSYCHOLOGICAL OPERATIONS:
Transcript by Charles S. Seketa Date January 17, 2004