Good luck. You're on your own, now.

The U.S. 5th Infantry Division (Mechanized) disintegrates.

By daybreak, the 1-40 Armored along with the remaining men of the 4-12 Cavalry, were being pressed by increasing numbers of Polish infantry and light armored vehicles, believed to be of the 10th Polish Tank Division. The infantry at Ostrów Wielkopolski have been identified as part of the Soviet 12th Guards Tank Division, a reserve formation from near Legnica.   At midday, pickets from 4-12 Cavalry reported a large mechanized column advancing up the Sieradz road. Already hard-pressed to deal with threats from the west and southwest, the 1-40 Armored was unable to spare anyone to respond to this new threat from the southeast.   Luckily it was about this time that 1st Brigade's 3-70 Armored and their 10 remaining M1A2's were approaching Kalisz from the north. They turned south off the road from Turek, the 2-21 Field Artillery unlimbered their 6 remaining howitzers, and the 3-10 Infantry followed the tanks in support.   3-70 Armored's tanks set up on a low rise about 2 kilometers north of the road, nearly out of fuel. The battalion commander soon saw the Soviet 124th Motorized Rifle Division stretch out on the road below him. At 1110 hours, they opened fire. The battle raged until nightfall and at its end, the 124th Motorized Rifle Division was a shell of its former strength. The road and the 2000 meters before 3-70's position were littered with the burning wrecks of its tanks and light armored vehicles.   As night fell, 1st Brigade was holding along the Sieradz road, the 4-12 Cavalry and 1-40 Armored were hanging onto Kalisz, 3-143 Infantry from the 2nd Brigade guarded the division's right flank north of Kalisz, with 3-77 Armored and 3-19 Field Artillery constituting the divisional reserve just outside Kalisz.   The division commander decided to attempt a breakout to the south, hoping to exploit the damage done to the 124th Motorized Rifle Division. 5th Division's remaining fuel, ammunition, and rations were distributed to the units and supply and maintenance personnel attached themselves to the nearest combat unit.   2nd Brigade would lead the attempt with the 3-77 Armored and 3-143 Infantry. 1st Brigade would cover its left flank by driving south from their blocking position. Divisional artillery would expend all remaining rounds on Ostrów Wielkopolski, hoping to disrupt any attack from the Soviet 21st Motor Rifles.   4-12 Cavalry's survivors would follow 2nd Brigade and move into the woods between Ostrów Wielkopolski and Ostrzeszów to cover the right flank.   1-40 Armored drew the short straw and would hold in Kalisz, then fight a delaying action to discourage pursuit.   While no one considered that the plan had much chance of success, the 5th Division didn't even get a chance to try it. The 21st Motorized Rifle Division and Polish 10th Tank Division struck 3 hours before dawn on the 18th, using infrared lights. 3-143 Infantry had already withdrawn and was marching through Kalisz when the first artillery rounds began falling. 1-40 Armored made the Pact forces pay dearly, but Polish tanks were in the division rear before dawn and division HQ was overrun at sunup.   The division commander radioed in the clear to all units, "Good luck. You're on your own, now."