Anna DeCola provided the majority of Somerville’s offense with one swing as she hit a three-run home run in the bottom of the third inning to give her team a lead it would not relinquish en route to a 5-3 win against Bound Brook in Somerville.Stepping into the batter’s box in a 1-1 game, DeCola’s blast gave Somerville enough breathing room for it to ride the rest of the way.