The Vandals tribe occupied the Balearic Islands
This statement is true. The original wheels were not actually used for
transportation as they are today, but rather there is actually evidence
they were created in Mespotamia in around 3500 B.C. to be used for
creating pottery. The wheel in its current form was not actually
invented until some 300 years later when they began to be used as part
of chariots.
The main reason why the march through Belgium helped France is that it won it some time (not much , the Battle of Belgium was only around 2 weeks long) to re-arrange their troops and specifically to move their troops further north to Paris and surroundings.