Need help remembering the title or author

[Brad]

I need help remembering the title or author of a scifi book (actually 3 or 4). It was published about 30 years ago or more, and all I can remember about it is the Earth was under attack by aliens who first sent their plant and animal life to transform Earth into their ecology. I believe they named the aliens Chittorr.

[Jonathan , Reader of the fantastic]

Is it A Matter For Men (The War Against the Chtorr, #1)? Some people recommended them to me once and they sounded familiar so I looked it up and found that book.

[[deleted user]]

Yes, .A Matter For Men (The War Against the Chtorr, #1) is the one. I really enjoyed the first book or two, but the last 2 were ponderous philosophy/psycho babble. Not enough action.

There is a trilogy that IMO is a prelude, The Far Side Of The Sky: Jumping Off The Planet ; Bouncing Off The Moon ; Leaping To The Stars. It sure reads like one to me, but someone said Gerrold said it wasn't or wasn't strictly one or something like that. Anyway, I liked them. Not as much as the first Chtorr, but better than the last 2.

[Brad]

Thanks Jonathan and Horace. Didn't know about the trilogy.