In this letter Ziyad had dissuaded Mu'awiyah from haste in this matter...

In this letter Ziyad had dissuaded Mu'awiyah from haste in this matter, and Mu'awiyah, on reading the letter, approved of his suggestion. But when Ziyad died, Mu'awiyah became more determined to follow up the question of allegiance to Yazid, and at first sent one…