Imam Ahmad ibn Ibrahim was disgusted with the Marehan for their treachery and called them; "This Somali" with utter disdain and contempt, their indecent behaviour was unnaceptable and he chased their leader back to Gedo.Then Hirabu, the chieftain of the Somali tribe of Marraihan, killed one of the eqquerries of the sultan 'Umar Din when he was in Nagab. The Imam (Ahmed ibn Ibrahim) heard about what Hirabu had done, and he said to the Sultan 'Umar Din, "This Somali has acted treacherously towards you and killed you equerry." So the Imam (Ahmed ibn Ibrahim), and the sultan with him prepared himself for an expedition and set out and arrived at the country of the Somalis, as far as Kidad. Hirabu, meantime had fled out and was hiding in his country.
Futuh al Habasha, Shihab ad Din Ahmad ibn Abdel Qadir, (16th century) page 105.
Imam Samaroon waging wars BEFORE Imam Ahmed Gragn
This means that the Gadabursi political stance changed years later and they became an enemy of the leader:
Among the Somali tribes there was another called Habr Makador, from which the Imam had demanded the alms tax. They refused to pay it, escorting to banditry on the roads and actomg evilly towards his country.
Futuh al Habasha, Shihab ad Din Ahmad ibn Abdel Qadir, (16th century) page 27
This trick is getting lame.