Jacob sent messengers ahead to his brother Esau (Genesis 32:4). The Hebrew word is malachim — messengers, angels. The midrash says this literally: Jacob sent actual angels. He had them from the moment of his birth — God had foreseen that Esau would try to kill him and assigned guardian angels from the start. "He who dwells in the secret place of the Most High shall abide under the shadow of the Almighty. For He will command His angels concerning you to guard you in all your ways" (Psalm 91:1, 11).
The angels who met Jacob at Mahanaim (Genesis 32:2-3) were the Canaanite angels returning to heaven as the Aramean angels took their places for the journey back into the land. Jacob saw the handoff and called the place "two camps" — because he was at the border between two divine jurisdictions. The protection never lapsed. The guards changed; the guarding continued.
Jacob's fear before meeting Esau was not cowardice. It was the appropriate response of a man who understood that having angels was not the same as having an army. The angels could protect him; they could not guarantee his brother's heart. Esau had four hundred men. Jacob had his family, his flocks, and the promise. He sent the messengers first because diplomacy before conflict is itself an act of faith — the belief that the situation might not require the force both parties are prepared to deploy.