Cavalry unit bringing up their guns. While you can't tell from the photo, the caption described it a the wz 1902, a 75mm gun.

Polish cavalry/artillery

German POWS in Warsaw. Guards are crew from Polish Home Army. These Nazi Germans were destroying Warsaw and their citizens.
Date and place:20.08.1944 PAST (Polish Telephone Joint-stock Company) skyscraper in Warsaw, Poland.

German invaders captured to captivity in Poland.

Chevrolet, Polish Army ambulance, 10th armoured cavalry brigade. A GIFT from Young Polish Womens Legion organisation from Chicago.
1944 Linlithgow, SCOTLAND, UK.
In photo: Polish mark PL on the car.