Oops I think that city is spelled Tiryns probably to keep it from being confused with Tyre.
Homer’s “mighty-walled Tiryns”... the Mycenaean-era city states appear to have behaved much like the more familiar classical Greek states, having specific territories in the immediate vicinity, and slowly changing sets of alliances (and in some places conquests).
Gla was an island in Lake Copais, but at some point the city-state Orchomenos undertook a large civil engineering project to levee the inflowing river around one edge of the lake to deprive it of a water supply, then drain the lake to create a large chunk of farmland (which is hard to find in Greece). Gla was fortified and garrisoned. Later, an rival state or other invader breached the levee and reflooded the plain. Apparently this was repaired at least once in antiquity, and again in modern times.