>>10912755It's part of the set, as are the rest of the mildly eclectic assortment of accessories. Don't think it'll be easy to track one down, the buckets seem to have been TRU exclusives though at least some of the contents have appeared elsewhere. If you're looking for a bridge there was an American Civil War set of Burnside's Bridge (by Americana?); not sure if it's any easier to track one down.
https://www.toysoldiersdepot.com/store.php/thedustyloft/pd187327/american-civil-war-plastic-burnside-bridgeWar is the mother of improvisations, up to and including pressing sugary treats into service as fortifications.
