Pontoon Bridge
A pontoon bridge is a temporary bridge that you make by lining up a lot of boats crossways across the river, and then putting wooden planks over the boats to make a bridge. You can see one in the picture.

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Famous uses of pontoon bridges in antiquity include Xerxes crossing the Hellespont in the Second Persian War and the one pictured above, Marcus Aurelius fighting the Marcomanni in the Roman Empire.
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