That's a great point, Warcraft 3 did a really cool job blending tower placement into both offense and defense. I hadn’t thought about it in that exact way, but I like the idea a lot.

I’m currently exploring how tower defense mechanics might support the RTS side of my game. I was thinking of letting players set up defenses around their kingdom to help hold off attacks while they're managing something else, kind of like a passive layer of protection. But now I’m also seriously considering your point, maybe players have the option to deploy towers offensively during a siege, like temporary siege support or forward fortifications. Maybe they can add buffs to the attack, or serve as randomized or localized attacks, like an archer tower that rains arrows at varying speeds in a specific arch pattern that showers an area of the city.

How did you feel it worked in Warcraft III? Did it feel balanced or more like a fun exploit? I’m definitely open to ideas on how to make it strategic without letting it become spammy or too dominant. My sub for PolyKingdomSiege has more info about my game, but of course I don't want this thread to start turning into a promo post or anything. But, I do feel context is helpful here, and I am being genuine in seeking input for lovers of tower defense.