castle can't defend enemy march

[LH of summerhall]

castle can't defend enemy march,even I got The bloody gates,my enemys still could pass through that castle to attack my Eyrie.

[Maester Rawl]

castle can't defend enemy march,even I got The bloody gates,my enemys still could pass through that castle to attack my Eyrie.

This is a bit of a limitation with Warband in general. There's been one or two mods that have that feature.