They are too lightly armed for the battle but highly motivated

Warsaw Uprising

Polish paratroopers (1st Independent Parachute Brigade) land between Arnhem and Nijmegen as the British force at Arnhem bridge is overwhelmed. Autumn rains impede the allied advance as the US 85th Division takes Firenzwold. 

Sosabowski's Polish Paras

This picture from The Warsaw Uprising was originally of a poor quality, but it is a classic; two boys that could be 12 years old, with rifles, running like real soldiers, across an area under fire.    