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Mind you, I do not intend to use Gar but Inf, as the later are potentially useful besides garrisoning.
 
If anyone intends to defend an island with just 1 unit, I'd assume that's just to scout any invasion as there's no one unit that can defend itself - so ideally militia if only sending "home guard" type units to alert the navy of any invasion.

EDIT: Before I get corrected, I know HQ are OP for defence, but they would be a ridiculously expensive unit to use for coast guard duty.
 
The intent is a corps of three divisions, which should be enough to ward off AI landings, no?
 
The intent is a corps of three divisions, which should be enough to ward off AI landings, no?
Most likely, or at least give you enough time to respond by sending a fleet or additional reinforcements.
 
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