Plugging tunnel entrances

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This a very common strategy employed by almost all genuses of ants across the globe. They plug the nest entrances of rival colonies so these have to waste time and energy to remove the debris.
Would be really cool if this was possible in surface fights.

I see this is super old but I agree it's a cool idea. In the beach mission with the flooding levels, it could be an option to battle your way to the rival colony entrance and plug them up, then freely take the spoils unmolested until they dug their way out. it could be a balanced strategy, because it would take time to plug, time you could be spending foraging. But then your collection afterwards would be more efficient, because you wouldn't be interrupted.