Battles of the late Third Age

[Numenorean]

Fingolfin:

The Raids into Ithilien were risky to say the best... I think they were conducted mostly for the moral of Gondor, to hear about victories even though the times were dark... Hope can be the strongest tool for keeping the civilian populous united.

I agree with all you say there Fin, but the Raids were also a sound tactical basis of guerilla warfare. Man-for-man, Gondor reaped considerable physical success from their forays into Ithilien: attrition & stealth are brutally effective (even in our times with all our satellites/spy drones/technology) and as you also said, it was of upmost importance that:

Gondor couldnt afford to let their enemies walk at will through the Land

It was a double-edged gain for Gondor as the Raids not only offered a glimmer of hope for their people, but they also bred fear of ambush and associated paranoia within the rank and file of the Enemy.
Given the harsh reality of Saurons overwhelming numerical superiority, surely guerllia warfare was Gondors only logical plan of resistance?