Alma 52:16 - 52:20
Alma 52: 16 And it came to pass that Teancum had received orders to make an attack upon the city of Mulek, and retake it if it were possible.
Moroni also issued Teancum to try and retake Mulek if possible.
Alma 52: 17 And it came to pass that Teancum made preparations to make an attack upon the city of Mulek, and march forth with his army against the Lamanites; but he saw that it was impossible that he could overpower them while they were in their fortifications; therefore he abandoned his designs and returned again to the city Bountiful, to wait for the coming of Moroni, that he might receive strength to his army.
Teancum came up with a strategy to retake Mulek but with further assessment he thought it was not possible with the numbers of men he had and give up the effort. He would wait until he was reinforced by Moroni.
Alma 52: 18 And it came to pass that Moroni did arrive with his army at the land of Bountiful, in the latter end of the twenty and seventh year of the reign of the judges over the people of Nephi.
In the end of the 27 year, Moroni does arrive with his forces to meet up with Teancum.
Alma 52: 19 And in the commencement of the twenty and eighth year, Moroni and Teancum and many of the chief captains held a council of war—what they should do to cause the Lamanites to come out against them to battle; or that they might by some means flatter them out of their strongholds, that they might gain advantage over them and take again the city of Mulek.
As the 28th year begins, a council of war was held. The subject was how do the Nephites get the Lamanites to come out of their fortified positions to engage in combat. Moroni knew they could defeat the Lamanites in battle but they would not come out to fight.
Alma 52: 20 And it came to pass they sent embassies to the army of the Lamanites, which protected the city of Mulek, to their leader, whose name was Jacob, desiring him that he would come out with his armies to meet them upon the plains between the two cities. But behold, Jacob, who was a Zoramite, would not come out with his army to meet them upon the plains.
Moroni sent representatives to the Lamanite commander of Mulek who name was Jacob. Moroni asked him to send out his army to fight the Nephites on the flat country just outside the city walls. However Jacob, who was a Zoramite, would not come out to fight.