Or HaChaim on Numbers 2:3/אור החיים על במדבר ב׳:ג׳

1 והחנים קדמה מזרחה, "And the ones encamped in the east toward the sunrising, etc." The reason this verse commences with the conjunctive letter ו is that it follows the command to establish the camp around the Tabernacle and only proceeds to give additional details.