Challenge: Xiangqi: Red Opening with Rook on File 8 - The Strategy of General Bạch Đằng - Can you solve it?

This Xiangqi formation resembles the Battle of Bạch Đằng, with the Red Rook appearing unexpectedly on File 8 like a 'Left Horse' move by the Southern army. Be cautious, as if not defended promptly, the Black Advisor on File 5 may be 'Captured by Horse' right from the start.