The German battalion was immediately employed on the front lines, while the Hungarian one initially served as mounted police, preventing looting and guarding the abandoned houses. The immigrants' previous World War I experiences were valuable in combat. However, most of the members were not professional soldiers; some were as young as 18 years old. Among the Germans there were gunners, pilots, machine gun experts and other war specialties; the defeat of the loyalists'
Renault FT-17 tanks is attributed to the previous experience of this battalion. On the other hand, historian Glauco Carneiro made a negative assessment: "the mercenaries, with rare exceptions, did not prove to be very useful or brave; they were mere adventurers seeking material results"; "as a rule, they had an appalling waste of ammunition, incessant fire against alleged loyalist positions, in a suspicious effort to avoid the adversary attack". Foreigners also contributed behind the front lines in the production and maintenance of war material. Maximiliano Agid personally supervised the production of grenades and incendiary bombs in the
São Paulo Railway workshops. German mechanic Ewald Bremesck headed the machine gun maintenance section, and Gerhard Nagel, who served in the
Imperial German Army's artillery, was responsible for gun maintenance. Some of these foreigners collaborated with the rebels without participating in the battalions, such as the Spaniard Manoel García Senra, superintendent of the São Paulo Railway, who participated in the production of armored cars. At the end of July 1924, the rebels withdrew from the city of São Paulo, heading inland. At least 180 fighters from the German battalion and 100 from the Hungarian battalion accompanied this movement, being joined, along the way, by immigrants residing in the interior, while other fighters deserted. Since leaving the city, the revolutionary command did not want to dismiss the foreigners, handing them over to government retaliation, but decided to allow their dismissal where they found safety and means for a new life. The Germans participated in the defense of
Botucatu, on 30 July. When the revolutionaries finally reached
São Paulo's border with
Mato Grosso, at
Presidente Epitácio, the Hungarian unit, still present on 7 August, was disarmed due to the risk of desertion. Still, some Hungarians continued to fight in the revolutionary army. Foreigners made up about half of the 570 men in the 3rd Revolutionary Battalion, forming its shock troops. The battalion, led by
Juarez Távora, began an offensive in Mato Grosso on 17 August. This raid was defeated with heavy casualties at Campo Japonês, in the vicinity of
Três Lagoas. More than half of the Germans indicted by the police were captured in that battle. The revolutionaries continued to western Paraná, where the fighting
continued until April 1925. The battalions no longer existed, but some of the original foreigners were still in their midst. In the new campaign, the foreign composition of the revolutionary army was reinforced by many Paraguayans. In April, seventy remnants of the former German battalion defected to Paraguay, when logistical difficulties prevented captain Kuhn from fulfilling his contract commitments. The São Paulo revolutionaries joined the
Rio Grande do Sul rebels and formed the Miguel Costa-Prestes Column, which remained in the struggle for the interior of the country. Some of its members were enlisted immigrants since 1924. Ítalo Landucci, from the Italian battalion, became
Luís Carlos Prestes' trusted man. == Reactions ==