The armonic shield didnīt exist. Well, in the game story yes, Harmony itīs a planet too hard to invade but the only true defense itīs a good fleet. At the start of the game, u will be attacked and u will need them (there is a guy with a fleet of 5 ship that claims the throne). If u are buying good ships u will be outnumbered and lose. A wise choise itīs to buy, Option A: firstly a FOX (this ship is for carry spies and avoid the enemy) and as many Hawks as u can(they are good medium sized ship used as First Line Ships). Option B: the FOX and some Vole(they arenīt good as Hawks but they are cheaper and can offer during the rest of the game a good Support Class Ships or Second Line).
I remember, before the arrival of this guy, an allied planet or neutral planet will ask u from aid because there are a 3 ships fleet from Sindycate. So if u chosed the option A, it will be hard to make in time to save the planet and come back to defend Harmony. If u left some ships in Harmony itīs a heavy risk of lost one of the battles. If u chose buy the Voles, u will got more ships and can easly divide your fleet. So you can win both battles. A another weak point of Vole, left defence in Harmony always, they are too slow to make in time for defence.
k: