To be completely ignorant, I do not understand the question.
Are you looking for any information on an unknown Thomas Leech who was a brethren of the Salvation Army from 1911- 1920 in Ontario? Why those dates? Have you been in contact with the Salvation Army? Do you have any background on Thomas?
No one replied to the first request, so perhaps they were also puzzled by what was required there, as was I.
Welcome to rootschat, are you living in Canada?
Added:
some background information
http://www.rootschat.com/forum/index.php?topic=633916.0Thomas Leech. The only info I have about him is he had a child Maria Carmel Leech. The mother was Elizabeth Mullen. Any information would be greatly appreciated.