What's the Name of That Book??? discussion

This topic is about
The City of Gold and Lead
SOLVED: Children's/YA
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SOLVED. YA Sci-Fi Trilogy - Children compete in a yearly sports competition for great glory. [s]
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"The resistance charges Will, Beanpole, and a German boy, Fritz, to infiltrate a Tripod city by competing in a regional sporting exhibition. The winners are taken to the Tripod city in a pressurized dome astride a river. Inside the city, the boys discover the Tripods' operators, whom they refer to as the "Masters". Human males are slaves inside the cities and furnished with breathing masks to survive the aliens' atmosphere, but are rapidly exhausted by the stronger artificial gravity and must therefore be periodically replaced...."
Hope this helped!
I read this around 1970 to 1973
Spoiler:
The next books in the trilogy detail that the winners are taken to another planet where it is hot and humid and the residents are giant slug-like creatures. They want strong kids as workers because the atmosphere is so punishing.