In 1534 Ulrich Schmidl set sail for South America where he participated in the Spanish conquest of the River Plate region. He remained there twenty years, after which he returned to his native town Straubing and wrote a diary of his adventures. This account represents one of the oldest and most important sources of information about the Spanish conquest of the River Plate region and the first settlements in Argentina. Although it is often difficult to identify tribes and villages due to his distorted spellings of the Indian names, historians regard the account as generally reliable. The text is preserved in three manuscripts in Stuttgart, Munich, and Hamburg. The Stuttgart manuscripts stems from Ulrich Schmidl himself. It is located in the Hautstaatsarchiv Stuttgart, where it is identified as Cod. hist. 4° 153. It was edited in 1893 by Johannes Mondschein, who, in the preface to his edition, characterized the manuscript as “die erste Niederschrift von der ungeübten Hand des eben von einem langen und wilden Kriegsund Abenteuerleben heimgekehrten Kriegsmannes.” The two other manuscripts are later copies, although the Munich manuscript does contain Schmidl's signature in his own hand.