: Major General William Nash, commander of American forces in Bosnia, visited the banks of the flooding Sava River on Friday and promised that his Army engineers would finish building a crucial bridge on schedule. "We'll put the pieces together and drive across tomorrow," said Nash, looking out over the mile-wide river that has so far refused to accomodate the American builders. Warm weather that melted mountain snows, rain that turned fields into mudflats and the inevitable rising waters have made the river the peacekeepers' worst enemy thus far in Operation Joint endeavor. Work on the pontoon bridge between Croatia and Bosnia was stalled earlier this week when the Sava burst its banks, flooding the engineers' encampment early Thursday morning. The bridge will be a major link for U.S. forces heading south for peacekeeping duties in Bosnia.