There are some ways that new military inventions can shape the outcome of war.
Swords can shape the outcome of war. Some swords can be made with lots of materials that make it stronger than the others. 
Warships can also shape the outcome of war. Warships can keep the other ships busy so the cargo ships can get through to the other side. Two ways to defeat someone they could board a ship or ram it. When they board the ship they can take the stuff. When they ram a ship, they make it sink to the bottom of the sea.
In conclusion, swords and warships are used for war. You use the swords to defend yourself and you use the warships to travel on water to get from place to place. These can shape the outcome of war. 
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