C'mon, the Stirling might have been a low-flyer but it could and did usually carry more bombs than that.
Example: Four Stirlings of No.15 Squadron RAF lifted off from Wyton on 30th April 1941; their first mission flying Stirlings, the target was Berlin - and each carried fifteen 500lb HE bombs. One actually made it to the Big City but found it under 10/10 cloud, so he came home via Kiel, where the bombs were dropped on a searchlight site.
Source:
The Stirling Story by Michael J F Bowyer; 2001, Crecy Publishing Ltd, Manchester, ISBN 0 947554 91 2, page 63.
