I didn't know that they actually targeted Byzantium in the fourth crusade. So that is interesting.
In the Peasants crusade, which was a pre crusade that started before the first crusade, you are right that the Byzantines did help them but they also got into a fight. But before that they got into altercations with locals in Byzantine territory. But the details I mentioned were wrong (bad memory). (I don't even know why I mention Byzantium as a city
) Read below.
People's Crusade - Wikipedia
Quote:
"Cologne to Constantinople[edit]
Peter and the remaining crusaders left Cologne about 20 April. About 40,000 Crusaders departed immediately. Another group would follow soon after; this group committed the
Rhineland massacres against Jewish populations and is sometimes referred to as the "German Crusade of 1096".
[5] When they reached the
Danube, part of the army decided to continue on by boat down the Danube, while the main body continued overland and entered Hungary at
Sopron. There it continued through Hungary without incident and rejoined the Danube contingent at
Zemun on the Byzantine frontier.
"Siege of
Niš on 4 July 1096
In Zemun, the crusaders became suspicious, seeing Walter's sixteen suits of armor hanging from the walls, and eventually a dispute over the price of a pair of shoes in the market led to a riot, which then turned into an all-out assault on the city by the crusaders, in which 4,000 Hungarians were killed. The crusaders then fled across the river Sava to Belgrade, but only after skirmishing with Belgrade troops. The residents of Belgrade fled, and the crusaders pillaged and burned the city. Then they marched for seven days, arriving at
Niš on 3 July. There, the commander of Niš promised to provide escort for Peter's army to Constantinople as well as food, if he would leave right away. Peter obliged, and the next morning he set out. However, a few Germans got into a dispute with some locals along the road and set fire to a mill, which escalated out of Peter's control until Niš sent out its entire garrison against the crusaders. The crusaders were completely routed, losing about 10,000 (a quarter of their number), the remainder regrouping further on at
Bela Palanka.
[5] When they reached
Sofia on 12 July they met their Byzantine escort, which brought them safely the rest of the way to Constantinople by 1 August."