Pontoon bridge in 638. The army of the Umayyad Caliphate built a pontoon bridge over the Bosporus in 717 during the Siege of Constantinople (717–718). The Carolingian army of Charlemagne constructed a portable pontoon bridge of anchored boats bound together and used it to cross the Danube during campaigns against the Avar Khaganate in the 790s. Charlemagne's army built two fortified pontoon bridges across the Elbe in 789 during a campaign against the Slavic Veleti. The German army of Otto the Great employed three pontoon bridges, made from pre-fabricated materials, to rapidly cross the Recknitz river at the Battle on the Raxa
Pontoon (boat) equipped with motor mount, battery storage area, fishing rod holders, canopy, fishfinder mount, small anchor and other required fishing gear. Such boats are suitable for ponds, lakes, rivers and seas during calm weather. However, due to light weight, they are susceptible to waves and windy conditions. Nonetheless, such boats are often used even for big game fishing. Pontoon boats for pleasure boating and fishing can be low cost for their capacity, and cheaper to insure than other boats, even when equipped with substantial engines. Pontoon boats are used as small vehicle ferries to cross rivers and lakes in many parts