Yup Wells wrote "first men in the moon".
I dunno about WOTW as a trilogy, it was originally a serial written for a London paper, sort of a "war diary". There IS a short story by Wells called "The Crystal Egg" which revolves around the finding of an object that works as a remote video link (as we would call it) to Mars, through which , what are cearly the Martians of WOTW are observed in their daily lives.
The "doing things in threes", is a huge extrapolation on the part of the George Pal movie and the spun off TV show (both great stuff, just sod all to do with Wells), it appears to be based on the bare fact of the the initial "beachead" consisting of the 3 cylinders which fell in close proxymity at Horsell, Byfleet golf course and Pyrford.
"The Tripods" was adapted from a trilogy by John Christopher, and yeah, I always took it as "what would have happened if the Martians had won" [1]. The BBC (and 7 network Australia) made the first two books, "the white mountains" and "the city of gold and lead", the third book "the pool pf fire" was never filmed. It featured a return trip to the city of the Masters, this time to attempt to destroy the motherfuckers.
I can see, that given that horsell common seems to have become less related to the red star of war and more to the brown star of rampant poovery, my choise is get buggered, or sit in a pub and get buggered up. Mine's a double TVR!!!!!!
I may instead take a quick tube trip to Primrose Hill, since that's where their main base was, where they were building their flying machine and stuff...tho I suppose All will tell me that Primrose Hill is now an open air heroin addict farm or something 
Actually, those chaps in Al's nice picture could well be off to the Thames valley to be BBQ'd/gassed/smashed to a pulp on a treetrunk...well maybe not, When did the British army start wearing Khaki?
[1] It bugs me to hear SO many smart arses decry Wells' ending..."blah blah blah....human disease would be harmless to Martians yadda yadda yadda"...not ONE of the fuckers has read the book it seems. Wells is CRYSTAL clear that they die because they have no defense against the perfectly ordinary bacteria we carry round in our guts and blood and skin, the stuff our imune system holds in check while we live, but which causes rotting when we snuff it. The Martians rotted in their machines, rotted alive, never knew what hit them.