Atkinson, p. 431
See this official report (scan)
See this official sketch of the Iraqi screen line
Atkinson, p. 433
From Wunderlich article: 
"SGT Ronald Jones (A-36 commander) picked up the narrative; "LT 'V' came over the net and said we had to move south about 800 meters.
As we were shifting, my loader was reloading a TOW missile.
When we took up position, we engaged another BMP and a tank.
We were getting low on ammo, so I told my driver to pivot so we could reload.
I realized we were still up front so we started backing up.
It sounded like we lost a track, so I told him to stop.
As soon as we stopped, we took a round in the transmission.
Later, we found out it was from a 12.7-mm machine gun."

Bin, Hill and Jones, page 195, according to a more detailed account by Sgt Jones: 
"The weather was bad, and I couldn't see anything without the thermal sights.
Just as I started to drop back into the hatch, I saw some sparks and dirt fly off the front of my vehicle-I knew we were being shot at.
I told the driver to back up.
He put it in gear, but all the transmission did was to whine."

By the somewhat flat path of the round (scan) and the position of the Iraqi T-72s, a 125 mm HEAT shell is suspected.
Preliminary reports also mentioned a Sagger, but the poor accuracy of this missile in such bad weather and close-range battle conditions makes this theory unlikely
See citation here.

"The round landed 10 metres short, spraying dirt and shrapnel against Sneed's Bradley and blowing him to the ground.." US Defense Department: Conduct of the Persian Gulf War: An Interim report to Congress (1991), Prologue, P-2.

Atkinson, pp.
431-432
Atkinson, page 432
Interview with a member of the crew of A-34
For the overall action, see Atkinson, pp.
428-433
Lowry, page 163
Atkinson, p. 431
See this official report (scan)
See this official sketch of the Iraqi screen line
Atkinson, p. 433
From Wunderlich article: 
"SGT Ronald Jones (A-36 commander) picked up the narrative; "LT 'V' came over the net and said we had to move south about 800 meters. As we were shifting, my loader was reloading a TOW missile. When we took up position, we engaged another BMP and a tank. We were getting low on ammo, so I told my driver to pivot so we could reload. I realized we were still up front so we started backing up. It sounded like we lost a track, so I told him to stop. As soon as we stopped, we took a round in the transmission. Later, we found out it was from a 12.7-mm machine gun."
Bin, Hill and Jones, page 195, according to a more detailed account by Sgt Jones: 
"The weather was bad, and I couldn't see anything without the thermal sights. Just as I started to drop back into the hatch, I saw some sparks and dirt fly off the front of my vehicle-I knew we were being shot at. I told the driver to back up. He put it in gear, but all the transmission did was to whine."
By the somewhat flat path of the round (scan) and the position of the Iraqi T-72s, a 125 mm HEAT shell is suspected. Preliminary reports also mentioned a Sagger, but the poor accuracy of this missile in such bad weather and close-range battle conditions makes this theory unlikely
See citation here.
"The round landed 10 metres short, spraying dirt and shrapnel against Sneed's Bradley and blowing him to the ground.." US Defense Department: Conduct of the Persian Gulf War: An Interim report to Congress (1991), Prologue, P-2.
Atkinson, pp. 431-432
Atkinson, page 432
Interview with a member of the crew of A-34
For the overall action, see Atkinson, pp. 428-433
Lowry, page 163
Battle of Phase Line Bullet