The 1st troop who has a favorite target meaning it will go and destroy all of those items before it goes to anything else. Giants go for defenses (canons, archer towers, mortars, etc.,) so usually deploy lots of them because they distract the defenses from barbarian groups and archer groups.
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The Tips For Building a Strong Clan: COC
AcakClash of Clans facts for new clans, clan wars, bases, and other. By jlayne.