Theodosius had stripped the river's defenses in response to the Vandal Gaiseric's capture of Carthage in 440 and the Sassanid Yazdegerd II's invasion of Armenia in 441. This left Attila and Bleda a clear path through Illyria into the Balkans, which they invaded in 441. The Hunnish army, having sacked Margus and Viminacium, took Singidunum (modern Belgrade) and Sirmium (modern Sremska Mitrovica) before halting. A lull followed in 442, and, during this time, Theodosius recalled his troops from North Africa and ordered a large new issue of coins to finance operations against the Huns. Having made these preparations, he thought it safe to refuse the Hunnish kings' demands.