I read a series of books in high school about the Earth being invaded by more technologically advanced race of aliens (aren't they all? But of course if they weren't then it wouldn't be much of a story) where we seemed to fight a fairly futile war.
It was set in the future - in London I'm pretty sure - as we were using "laser rifles" but the fight suddenly turned in our favour when we realised their full body shielding, while being impervious to laser fire was in fact highly vulnerable to solid objects: projectile weapons like pistols and rifles. This is identified when the protagonist watches a bunch of alien soldiers being injured by the rubble from a collapsing bridge.
Anyone know this?