Both Uses of

annihilate
in
Unbroken, by Hillenbrand

That August, the Japanese War Ministry would issue a clarification of this order, sending it to all POW camp commanders: At such time as the situation becomes urgent and it be extremely important, the POWs will be concentrated and confined in their present location and under heavy guard the preparation for the final disposition will be made ....Whether they are destroyed individually or in groups, or however it is done, with mass bombing, poisonous smoke, poisons, drowning, decapitation, or what, dispose of them as the situation dictates ....In any case it is the aim not to allow the escape of a single one, to annihilate them all, and not to leave any traces.†
p. 199.4

That night, the commander sent a radio message to Palawan: "Annihilate the 150 prisoners."†
p. 273.1 *

Definition:

to completely destroy or defeat