Many players of "Assassin's Creed: Syndicate" said that they could not accept the main mission. In fact, you need to complete the partner missions to obtain the main mission. After completing 4 partner missions and engaging in gang wars to liberate the Whitechapel District, you can obtain the next main mission. The partner task is composed of 4 small tasks, and the difficulty is very low, and the order can be arbitrary. Different tasks are also linked to the favorability of different partners. When the favorability reaches a certain value, you can get additional rewards.
This gang stronghold mission also has some teaching qualities. There are 2 special enemies among the 10 enemies: sniper and vanguard. The former has a wide field of vision, and the latter will immediately run back to the main room to call for reinforcements once it spots the player. Snipers can assassinate enemies from high places, and vanguard soldiers are actually no different from ordinary enemies.
But be aware that the fully synchronized challenge in this area is to free the captured Cinder Gang. There will be enemies threatening the captured Cinder Gang members next to them. It is recommended to deal with them last, otherwise the rescued gang members running around will attract enemies. If they die, the synchronized challenge will fail.
After completing the mission objectives, you will enter a small gang war. After the enemies are eliminated, the mission is completed.
Summary: Partners are very important, so you must complete the partner mission to be eligible for the main mission.