Final answer:
Hera could blame various gods or mortals for the Greeks' success in war, such as Aphrodite's favoritism towards the Trojans in the myth of the Trojan War, but no specific answer exists without more context.
Step-by-step explanation:
The question you've asked about Hera blaming someone for the Greeks' success in the war ties into the rich tapestry of Greek mythology. Hera, often vindictive due to Zeus's infidelity, could blame any number of deities or mortals for the turn of events favoring the Greeks, especially if their success went against her interests or plans.
Since the question does not specify a particular war or myth, Hera's blame could be directed toward anyone she sees as having influenced the outcome, including other Olympian gods or even heroes favored by the gods.
For example, in the Trojan War, it was well-known that Hera was against the Trojans, who were supported by Aphrodite. Hera might blame Aphrodite for any success the Greeks experienced, due to Aphrodite's favoritism towards Paris and the Trojans. However, without a specific context, there is not one definitive answer to this question.