When the Lion got caught in a net,
All his strength was no use.
'Twas the poor little Mouse
Who nibbled him out of the net.
SMALL CAUSES MAY PRODUCE GREAT RESULTS
Source: W. J. Linton's fables in verse, with illustrations by Walter Crane: Fable 7.
Click here for a SLIDESHOW of all the Crane images. I really like the way that Crane has combined here the traditional Aesopic fable of the lion and the mouse along with the variation (found first in Abstemius, I believe) where the mouse wants to marry the lioness!