halder noted in his entry of 10 june 1940 that group guderian managed to reach joinville ahead of schedule, leading the spearhead east of the river oise. 1st panzer division advanced along both banks of the retourne river, reaching juniville in the afternoon. there, the division was counterattacked by french armored contingents that were repelled after some two hours of combat. 1st panzer division suffered numerous casualties at the hands of french char b1 model heavy tanks that 3.7 cm and 2 cm cannons were almost completely ineffective against. another such tank battle took place north of juniville in the afternoon.