  the battle of fort oswego was one in a series of early french victories in the north american theatre of the seven years' war won in spite of new france's military vulnerability. during the week of august 10, 1756, a force of regulars and canadien militia under general montcalm captured and occupied the british fortifications at fort oswego, located at the site of present-day oswego, new york. in addition to 1,700 prisoners, montcalm's force seized the fort's 121 cannon. the fall of fort oswego effectively interrupted the british presence on lake ontario and removed it as a threat to the nearby french-controlled fort frontenac. the battle was notable for demonstrating that traditional european siege tactics were viable in north america when applied properly in the right circumstances and terrain. == background ==  following the beginning of open conflict between french and british colonists in 1754 with the battle of jumonville glen, the governments of britain and france both sent regular army troops to north america to further contest the disputed territories of the ohio country and other border areas, including the frontier between the french province of canada and the british province of new york, an area in present-day upstate new york that was then largely controlled by the iroquois nations. part of the british plans for 1755 included an expedition to take fort niagara at the western end of lake ontario. the planned route for this expedition followed the oswego river to the lake, with a 
1756_in_France 1756_in_North_America Battles_involving_France Battles_involving_Great_Britain Battles_of_the_French_and_Indian_War Conflicts_in_1756 Pre-statehood_history_of_New_York