(The poem is "A Thousand Martyrs" by Aphra Behn)
Answer: They reveal that the speaker enters relationships for her own amusement.
Explanation: The word alone is crucial here. The author is telling us that she always took "the glory and the spoils" (the things you take after winning a war) for herself only, laughing, i.e., amusing herself while being unworried with the other person's suffering.