skirmishes are fought at random REAL battles were still fought on open plains, not because of an obscure honor code but for the simple reasons I already stated: space to deploy and use one's troops, overviewing your own troops, safety reasons, tradition...
the majority of magor battles were fought between two camps whose armies met on a great plain when one was in the area. Skirmishes however took place everywhere and always, the developement of thureophoroi only shows that skirmishes were Important and that flanking was a good Idea. It did happen(probably quite often) that skirmishers, cavalry or shock infantry or other dudes who were assigned their roles hidd in the battle defineing forest that BORDERED the battlefield and as part of a sly plan sprung out to attack the outflanked foe from behind.
And when it says the Greeks used broken terrian than that probably means they occupied passes/choakepoints, like at thermopylai, not wooded hills with a slope of 60°.
in a nutshell: Skirmishes + Forest = all the time; Real battles + Forest = seldom; Army Movement + Forest = plan B.
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