Which defensive outcome arose when medieval castle builders implemented concentric curtain walls?

💡 Explanation

When castle builders adopted concentric curtain walls, increased defensive depth occurred because attackers faced multiple fortified lines, each providing overlapping fields of fire, slowing their advance and increasing casualties, lowering the overall siege attrition rate. Therefore lowered attrition results, rather than food preservation, fire resistance, or archer effectiveness, which rely on different mechanisms.

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