traces of sarin in an "old round" would NOT cause the soldiers to become ill - AND - if you had been following this thread with ANY semblance of interest in what exactly had been ound you would know that the round contain the chemicals necessary to create sarin and the the mechanism needed to mix the chemicals [normally] is the firing of the round itself via artillery. Simply exploding the round would DESTROY the gas inside!
Of course we can't let a few pesky facts get in the way of a good denial now can we??