Operation guide: TR-10
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The tenth tutorial operation of Arknights, TR-10 gives an insight on deployment orders which affects the enemy's targeting and can make all the difference in an operation.
Once Dobermann finishes her explanation, deploy Jessica on E5 facing right. She will be able to easily shoot down the incoming two Monsters, but afterwards two Firebomb Throwers will spawn and attack Jessica as soon as they reaches D7. Jessica will be KO'd before she can take out both Firebomb Throwers, and Dobermann points out that enemies will always attack the last deployed friendly unit in their range. This is definitely something the player has to remember, since deploying weaker Operators before stronger Operators will protect them from enemy retaliation and allowing them to last longer than one might expect (though some Operators have skills and talents which overrides this in certain ways). For more elaborate detail regarding this, see the Aggression article.
Therefore, deploy Beagle on C6 and notice that the Firebomb Throwers will attack her instead of Jessica, thus buying her enough time to kill the Firebomb Throwers.