Background: Charles Dillon Stengel was born on July 30, 1890, in Kansas City, Missouri. His ancestry involves German and Irish; his parents--Louis Stengel and Jennie (Wolff) Stengel--were from the Quad Cities area of Illinois and Iowa, and had moved to Kansas City soon after their 1886 wedding so Louis could take an insurance job. "Charlie" was the youngest of three children, and the second son. Charlie Stengel played sandlot baseball as a child, and also played baseball, football and basketball at Kansas City's Central High School.
Context: Stengel thought the 1943 season would be his last in baseball; Edna urged him to look after the family business interests full-time, and Casey, who had always been an athlete, was reluctant to show himself at a baseball stadium with the imperfectly-healed injury. But early in the 1944 season, the minor-league Milwaukee Brewers had a managing vacancy to fill, as the Chicago Cubs had hired away the Brewer manager, Charlie Grimm, who had played with Stengel on the 1919 Pirates. Grimm told the Cubs he was obliged to see the Brewers had a competent replacement, and urged the Brewers to hire Stengel. The team owner, Bill Veeck, stationed with the Marines on Guadalcanal, thought ill of Stengel as a manager, and was very reluctant in his consent when reached by cable. Stengel was adept at fostering good relations with reporters, and the very talented team continued to win; by the end of May, Veeck had withdrawn his objections. The team won the American Association pennant, but lost in the playoffs to Louisville. Veeck, having returned to the United States, offered to rehire Stengel for 1945, but Stengel preferred another offer he received. This was from George Weiss of the New York Yankees, to manage the team Stengel had begun with, the Kansas City Blues, by then a Yankee farm club. Kansas City had finished last in the American Association as Milwaukee won the pennant, making it something of a comedown for Stengel, who hoped to return to the major leagues. Nevertheless, it was in his old home town, allowing him to see friends and relations, and he took the job. The Blues finished seventh in the eight-team league in 1945. Although there was no major league managing vacancy Stengel could aspire to, the Oakland Oaks of the Pacific Coast League had fired their manager, and approached Stengel. The baseball played in the PCL was close to major league level, and the league featured many aging big leaguers finishing their careers. Also attractive to Stengel was that the league had three teams in Southern California, allowing him to spend more time at his home in Glendale. To that time, the club had won only one pennant, and was something of a weak sister to its crossbay rivals, the San Francisco Seals, but owner Brick Laws believed Stengel could mold the players into a winning team. The Oaks finished second in the league behind the Seals in 1946, winning the first round of the playoffs against Los Angeles before losing to San Francisco in the finals. They finished fourth in 1947, beating San Francisco in the first round before losing to Los Angeles. Stengel managed the Oaks for a third year in 1948, with the roster heavy with former major leaguers. Among the younger players on the team was 20-year-old shortstop Billy Martin. Stengel was impressed by Martin's fielding, baseball acuity, and, when there were brawls on the field, fighting ability. The Oaks clinched the pennant on September 26, and defeated Los Angeles and the Seattle Rainiers to win the Governors' Cup. The Sporting News named Stengel the Minor League Manager of the Year. CANNOTANSWER
Question: when did he return to the minors?. Whats the answer?

1944