The proportionality principle in the jus ad bellumIt requires the consideration of the likely costs and benefits of doing so, as opposed to choosing alternative courses of action or maybe not. Al this before engaging in war or the use of force.
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Other clans resented the Fujiwaras and clan leaders built their own armies and fought against the Fujiwaras with their clans.
The battle at Lexington and Concord shaped the american revolution through it was the first victory and battle of the revolution so in this it brought more people to the american cause seeing that their militia were able to take on the world power of Britain and succeed in doing so.