They are made for putting on the top of Ancient battle flag. When the war has begun they will bring the flag along to lead the troops.
Sometimes called the flag "Thong shai Chalermpol" Because the Period of Ancient war in Thailand takes so long long time, can say that war happens all the time(No Peace). So in the short peaceful moment, they must make merit and make lots of Amulets included some of Phra Yod Thong.
Actually Phra Yod Thong has many shape and size and came from different period. The Bigger one should be the one they put on Main flag or Royal flag (height 5-6 c.m.) This one was rare. The smaller one, they put on the Normal troops Flag, and some they just put in the Pagoda or Jetiya, never use in battle.