What I don't understand though, is the complete sentence. Who is the siege side? the side that is defending or attacking? I also assume enable means being able to construct defensive works. Anyhow here are two possibilities.
Defensive works enable only for siege side.
Only the attacker can construct defensive works in a siege. (only the side attacking can build defenses)
Only the defender can construct defensive works in a siege. (only the side defending can build defenses)
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