This page contains Splinter Cell: Chaos Theory Hints for Xbox called "Defeating ISDF guards" and has been posted or updated on Aug 18, 2009 by amyxdea. Let us know what you think of this Hint by thumbs voting.
Defeating ISDF guards
In any mission where you must deal with an ISDF guard, you cannot knock them out with gas. Try using a shotgun.
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