Kitebrook's Year 3 & 4 pupils competed at the Cheltenham College Prep Rugby Festival.
The older youngsters beat Dean Close, St Hugh's and Beaudesert to set up an open final with Winchester House where they ended their unbeaten record.
Meanwhile, the under eights scored 19 tries.
The teams also recorded solid wins over Cokethorpe on another date.
In football, the Moreton-in-Marsh school's pupils finished fifth out of eight at the Sunningdale tournament.