Oba 1:11 In the day that thou stoodest on the other side, in the day that the strangers carried away captive his forces, and foreigners entered into his gates, and cast lots upon Jerusalem, even thou wast as one of them.
Oba 1:12 But thou shouldest not have looked on the day of thy brother in the day that he became a stranger; neither shouldest thou have rejoiced over the children of Judah in the day of their destruction; neither shouldest thou have spoken proudly in the day of distress.
We agree on something.
Verse 11 - In the day that thou (Esau - representing something) stood on the other side while the strangers carried away captive his (Jacob's - representing something) forces and foreigners entered into his (Jacob's) gates and cast lots upon Jerusalem, even thou (Esau) was one of them.
Verse 12 - But thou (Esau) should not have looked on the day of your brother (Jacob) in the day that he (Jacob) became a stranger. Neither should you (Esau) have rejoiced over the children of Judah in the day of their destruction. Neither should you (Esau) have spoken proudly in the day of distress.
Is there enough information there to say with certainty when "the strangers carried away captive Jacob's forces?
Is there enough information to say when Jacob became a stranger?
Is there enough information to say when Esau rejoiced over the destruction of Judah?
In my opinion there is not enough information in those verses to answer any of those questions. So we would have to go further in the story.