What the US Army should learn from Ukraine's hasty retreat from a Russian assault

• Ukraine's retreat under heavy fire in Avdiivka should be a wake-up call for the US Army.
• A US Army officer argued the operation is proof that withdrawals must be carefully planned.
• The force covering the retreat may need more key weapons and sensors to stall the attacker.

The art of war isn't just knowing how to attack or defend. It's also knowing how to retreat with minimum losses in personnel and equipment.