Read the excerpt from part 1 of the odyssey. my men were mutinous, fools, on stores of wine. sheep after sheep they butchered by the surf, and shambling cattle, feasting,—while fugitives went inland, running to call to arms the main force of cicones. this was an army, trained to fight on horseback or, where the ground required, on foot. they came with dawn over that terrain like the leaves and blades of spring. what theme is supported by the excerpt? the victors of war earn rewards. the fugitives of war suffer in isolation. soldiers should take proper care of their horses. soldiers must be wary of their enemies.

Soldiers must be wary of their enemies.

Explanation:

In the excerpt, after Odysseus's men think they've won, they let the fugitives go in land. The fugitives then go get the Cicones' army.  The army comes down to the beach and wipes out Odysseus's men. Since Odysseus's men underestimated the enemy, they are destroyed. Therefore, the best theme of this excerpt is that soldiers must be wary of their enemies. Even though the men do reap the benefits of their initial victory by gaining stores of wine and mutton, they do not leave the beach alive. The fugitives are not isolated because they have an entire army the run to for help. The only mention of horses is that the army can fight on horseback or on foot. This is not enough to develop a theme.

what is the context here? we need to know what story you're talking about : )

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).