Current official github page contains 1.0, 1.0rc1 and 0.711 as the most old versions.
But on archive.org is avaliable most older just 0.7 - https://web.archive.org/web/20040803161 ... thBinaries
Main page on archive.org has information about 0.4 version - https://web.archive.org/web/20031222120 ... snoth.org/
But the most older versions - 0.1, 0.3 and 0.3.4 as minimum - doesn't mention anythere exept wikipedia and author writes. Possible links was avaliable here but now they dead:
https://www.wesnoth.com.pl/downloads.php
https://www.wesnoth.com.pl/downloads.ph ... load_id=13
https://www.wesnoth.com.pl/downloads.ph ... nload_id=8
https://www.wesnoth.com.pl/downloads.ph ... nload_id=6
Few more early version mentioned here:
https://latestversionof.com/v/229995/
https://latestversionof.com/v/229963/
https://latestversionof.com/v/229978/
https://latestversionof.com/v/229998/
https://latestversionof.com/v/229968/
I think preserve these versions would be good if they wasn't saved on official github page.