Does "rattle" here mean "an instrument contrived to make a rattling sound, esp. a baby's toy filled with small pellets that rattle when shaken"?
Like this:
Context:
Common versions of the nursery rhyme include:
Tweedledum and Tweedledee
Agreed to have a battle;
For Tweedledum said Tweedledee
Had
spoiled his nice new rattle.
Just then flew down a monstrous crow,
As black as a tar-barrel;
Which frightened both the heroes so,
They quite forgot their quarrel.
Source: Wikipedia