In such a situation, Eunice had no choice but to risk it all. Seizing the opportunity before the Kairouan Fortress was fully prepared, he preemptively attacked the defenders outlying the fortress, in an attempt to bypass it and directly seize the affluent city of Sousse, where he could obtain supplies.
Of course, if Eunice was not planning to do so, Joseph's French military advisors staying by his side would also suggest a raid.
Joseph's Tunisian strategy from the beginning was to set a wolf to kill a tiger, letting Eunice and Hamoud Ali fight among themselves, depleting the living force of the Tunisian Guard. What he held in reserve was his true objective.
To accomplish this plan, he initially intended to send spies to infiltrate the Ksar Hellal Palace, posing as military experts to offer Ali "advice."