The first of the 87 tanks and 144 military vehicles were being unloaded in the port of Bremerhaven on Friday.
The equipment and 3,500 US troops are to be deployed along Nato's eastern frontier.
The deployment aims to allay worries of potential Russian aggression in eastern Europe.
However, some fear the large number will exacerbate tensions with Moscow.
Leaders of the left-wing regional government of Brandenburg - one of the German states through which the American brigades will be transported over the next two weeks - have called for further talks with Russia.