The Battle of Hindakh

From Shawalah 3 to Shawalah 5 is two full years so technically your birthday cannot be on both of those days that you were 14 and 15 that's really not possible. You are either 14 and 16 or you know you get my point here. Still Al-Aqulin I mean the point is roughly who kept track of birthdays back then anyway. Now what was the battle how did it start? The reason of this battle was an instigation by the tribe of the Banun al-Dir  to throw a rock onto the Prophet Sallayhi Salaam when he was sitting at their fortress. So they said this is your opportunity let's roll the boulder