As you say Tim, this is a hard one to catch the words - here's a bit more of what I hear, in hopes that it might jog someone else's memory or help with your search:

Chorus
Say forward lads step heel and toe
A man who fought ... ?
There's nought but freedom we would know
Kin we follow the gallant weavers

Oh the battle by betrayers won
Our country by timeservers run
The fight has barely but begun
For aye 'twas with the weavers

[There's just one more verse, and corrections to the above]