Route 9W passes across a bridge over Popolopen Creek just steps away from Fort Montgomery. This is the view from the bridge. Farthest away is the Bear Mountain bridge over the Hudson River. Next comes a railway bridge and finally the footbridge over the creek that replaced the pontoon bridge in use during the Revolutionary War to connect Forts Montgomery (on the left in the picture) to Fort Clinton (on the right).
I read somewhere (but can no longer remember where) that the bulk of the ammunition for the twin forts was stored at Fort Clinton – to be taken down and over Popolopen Creek to the more heavily fortified Fort Montgomery as required. Unfortunately the British surprise attack over the Timp pass, through Doodletown and down Popolopen Creek cut Fort Montgomery off from Fort Clinton and meant that it soon ran out of ammunition.