《明史·列传·卷一百一十》
去年秋天，俺答向东迁徙，京都戒严，以致倡议运来砖石、泥灰堵塞城门凭城据守。
昨秋，俺答东行，京师戒严，至倡运砖聚灰塞门乘城之计。
Last autumn, Anda migrated eastward, and the imperial capital was put under martial law. It even proposed transporting bricks and clay to block the city gates and garrison the city with defensive forces.