the attack began at 5:35 on the morning of 10 may 1940. guderian personally attended the attack alongside 1st panzer division against wallendorf in luxembourg. luxembourg, which had only maintained a token military force, was quickly overwhelmed, and 1st panzer division reached the belgian border at martelange by the afternoon. "großdeutschland" had undertaken a paradrop mission on the other side of the belgian border to gain a headstart on the armored units, but 1st panzer division caught up on the first day. 10th panzer division attacked towards habay-la-neuve and was opposed by the quick response of the french 3rd colonial infantry division, although the 3rd colonial did not manage to significantly impede the 10th panzer's advance.