To break through or break down; to create a breach in something, especially a wall or fortification.
From 'em-' (to put into or make) combined with 'breach' (a gap or break). 'Breach' itself comes from Old French 'breche,' related to breaking.
Medieval siege warfare depended entirely on embreachers—soldiers whose job was literally to break through castle walls with battering rams and explosives, a dangerous and essential role.
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