| Conflict: | 2nd Battle of Kōnodai |
| Partof: | the Sengoku period |
| Date: | 1564 |
| Place: | Kōnodai, Shimōsa Province |
| Map Type: | Japan Chiba Prefecture#Japan |
| Map Relief: | yes |
| Result: | Decisive Hōjō victory |
| Combatant1: | forces of Hōjō Ujiyasu |
| Combatant2: | forces of Satomi Yoshihiro |
| Commander1: | Hōjō Ujiyasu Hōjō Ujimasa Hōjō Tsunashige Hōjō Ujiteru |
| Commander2: | Satomi Yoshihiro Satomi Chokuro Ōta Sukemasa |
| Strength1: | 20,000 |
| Strength2: | 8,000 |
In the second Battle of Kōnodai, fought in 1564, Hōjō Ujiyasu led his men to victory against Satomi Yoshihiro. Both Ujiyasu and Yoshihiro were the sons of the commanders at the first battle of Kōnodai, in which Hōjō Ujitsuna defeated the combined forces of Satomi Yoshitaka and Ashikaga Yoshiaki (Oyumi).[1]
Outnumbered 20,000 to 8,000, Satomi fell back when the Hōjō vanguard advanced. But this was a feint, and an attempt to draw his enemy into a trap. However, Hōjō Ujiyasu expected a trap of this sort, and had sent his son, Ujimasa, with a small force to attack the Satomi rear, surrounding, and later Ujiyasu defeated Yoshihiro. In the ensuing battle, Satomi Yoshihiro saw his son, Chokuro, killed by Matsuda Yasuyoshi, a Hōjō retainer.
Hōjō Ujiyasu celebrated his victory with a poem:
Conquering the foe
As I wished at Kōnodai
Now do I behold
The evening sunshine of Katsuura
After the battle, Matsuda Yasuyoshi who kill Yoshihiro son, feeling remorse at killing such a young boy, later Matsuda entered the monk.