The art of war is extremely complex and there is no way to cover everything in one Lemmy comment.
However, I can summarize: An attacker or defender simply needs to prevent the opposing side from being able to support a war.
While there are thousands of different things that can support war, it usually boils down to raw manpower, food/supplies, weapons, energy, logistics and communications. Failing to defend, or not having the capability to replenish/repair those things is usually a quick game-over as those items are highly dependent on the other. Anything that supports those key items is a target of the enemy, so those are the things that are stockpiled, fortified or should be rebuilt quickly.
The art of war is extremely complex and there is no way to cover everything in one Lemmy comment.
However, I can summarize: An attacker or defender simply needs to prevent the opposing side from being able to support a war.
While there are thousands of different things that can support war, it usually boils down to raw manpower, food/supplies, weapons, energy, logistics and communications. Failing to defend, or not having the capability to replenish/repair those things is usually a quick game-over as those items are highly dependent on the other. Anything that supports those key items is a target of the enemy, so those are the things that are stockpiled, fortified or should be rebuilt quickly.