debouche

verb

1. To enter into battle.

   “he debouched by the great high road through the forest, in the rear of the Austrian and Bavarian armies, while General Moreau attacked in front.”

2. To discharge into a larger body of water such as a lake or sea.

   “He chose a place called Colmnakill, about six miles farther down the Spey, where a tributary stream, debouching into that river, gave him protection on one side”