What does Genesis 32:18 mean?

Esau and 400 men are on their way to intercept Jacob's family, for reasons unknown (Genesis 32:6). Fearing the worst, Jacob has split his caravan into two separate camps (Genesis 32:7–8). He has also prayed, in desperation, for God's protection from his own twin brother (Genesis 32:9–12). Finally, Jacob has begun to orchestrate a dramatic presentation of lavish gifts. Five individual herds have been prepared: goats, sheep, camels, cattle, and donkeys. These are being sent, one at a time, to be presented to Esau before he arrives. Clearly, Jacob's hope is to soften his brother's long-simmering wrath (Genesis 27:41–45).

Jacob sensibly assumes Esau will ask the servants what they're doing. Now he tells them specifically how to answer: These animals belong to "your servant Jacob." He is giving them to "my lord Esau" as a gift, and he is coming behind us. This tactic of presenting multiple gifts would make each one seem unique and special, rather than simply coming as a single large group. The repetition of Jacob's servant-like attitude would also be repeated, and made clear to Esau.