In Letter (11), Imam Ali (a.s.) provides crucial instructions to an army being sent towards the enemy. This letter was written during a time of conflict in Imam Ali's caliphate, particularly during the battles of Jamal and Siffin. The letter emphasizes military strategies, precautionary measures, and the organization of troops.

Imam (a.s.) advises the army on how to position themselves during battle. This guidance highlights the importance of understanding geographical conditions for success in warfare. He instructs that the army should be stationed near hills, mountains, or river bends to protect themselves from enemy attacks. This is a vital strategy that limits the enemy's movement.

The Imam stresses the significance of the vanguard, which serves as the eyes of the army, providing critical information about the battlefield. This underscores the importance of intelligence in warfare. He also advises the soldiers to avoid scattering and to dismount and march together, ensuring their strength remains intact.

Furthermore, the Imam emphasizes the need for precautionary measures at night, such as forming a circle with spears. This is to ensure the safety of the troops during the night and to guard against sudden enemy attacks. These instructions not only apply to the battlefield but also impart important lessons for life in general, highlighting the significance of caution, planning, and unity.