The difference is that the Soldier's intentions were not to use violence, but just stop the boat from reaching its target. But they were confronted with violence, and protecting their lives, had to react.
La diferencia era que los soldados pretendían no usar la violencia, sino solamente detener el barco antes de llegar a su destino, pero se les respondió con violencia y tuvieron que actuar en defensa de sus vidas.