Real life lessons right here.

If my son didn’t dig a series of trenches around his pillow fort I would exile him. Strategic incompetence like that is a liability.

All fun and games until the kid starts dumping boiling oil over the fort walls

One of my favourite pieces of crossover between game strategies and “the art of war” is using account siphon in Netrunner.

Bring war material with you from home, but forage on the enemy. Thus the army will have food enough for its needs.
[…]
15. Hence a wise general makes a point of foraging on the enemy. One cartload of the enemy’s provisions is equivalent to twenty of one’s own, and likewise a single picul of his provender is equivalent to twenty from one’s own store.

Thus the highest form of generalship is to balk the enemy’s plans; the next best is to prevent the junction of the enemy’s forces; the next in order is to attack the enemy’s army in the field; and the worst policy of all is to besiege walled cities.

The rule is, not to besiege walled cities if it can possibly be avoided. The preparation of mantlets, movable shelters, and various implements of war, will take up three whole months; and the piling up of mounds over against the walls will take three months more.

Sun Tsu - The art of war, 3:3-4

Those kids have a healthy appetite.

Or teach her how to build a trebuchet.