Reinforcements Arrive is the 651st chapter of the Kingdom manga.
Summary[]
The 30,000 Man'U Army clashes against 30,000 Mou Bu Army. Both Commander-in-Chiefs are on the frontlines demonstrating their respective destructive power. Man'U also has his honor guard with him. On Qin's left wing Enba Unit had trouble so Mou Bu had to change direction and help them out. Other Chu armies didn't move.
However, after a while Sen To'Un decides to attack out of excitement. At this moment everyone noticed 20,000 reinforcements of Tou Army approaching. Tou explains that the city was never conquered, because it's four commanders were former great generals from states absorbed into Chu in the past. Roku O Mi comments that they would need twice the number of troops for this battle and says he's getting pumped up. Then they rush to support each wing respectively.
Mou Ki thinks that there's still no hope for them without Wei joining. The chapter ends with the arrival of reinforcements from the capital, Chin, the 15,000 of Kou Yoku Army and 15,000 Haku Rei Army.