Defeat the landing across several domains

How can a defender counter a modern amphibious force?

Use mines, artillery or coastal missiles, submarines, air strikes, and an armoured counterattack against the beachhead.

Defence against an amphibious assault requires several layers. Mines obstruct the approach and constrain where ships and connectors can move, while artillery and truck-mounted anti-ship missiles threaten vessels that must remain close enough to sustain the landing. Submarines and air strikes attack the sea base and its escorts from other domains. If the force gets ashore, an armoured counterattack tests whether it landed enough anti-armour weapons, tanks, and supplies to survive.