Mormon 3:4

And it came to pass that after this tenth year had passed away, making, in the whole, three hundred and sixty years from the coming of Christ, the king of the Lamanites sent an epistle unto me, which gave unto me to know that they were preparing to come again to battle against us.

After this tenth year passed, making 360 years since Christ came, the king of the Lamanites sent me a letter. He told me they were getting ready to come fight us again.

After that tenth year—three hundred sixty years since Christ came—the Lamanite king sent me a letter. He was preparing to attack us again.