Herman Lamm
Prussian soldier turned bank robber who systematized heists.
Herman Karl Lamm, nicknamed Baron Lamm, was a German-American bank robber born on April 19, 1890, who died on December 16, 1930. After serving in the Prussian Army, he moved to the United States and applied military-style discipline to his criminal work. He created the practice of carefully studying a bank beforehand—known as "casing"—and mapping out escape routes before any robbery. This systematic approach, called "The Lamm Technique," involved hours of observation, detailed floor plans, notes on safe locations, and sometimes sending a man posing as a journalist to gather information. Each gang member had a specific role, such as lookout, getaway driver, lobby man, or vault man, and rehearsals included full-scale mock-ups of bank interiors timed with stopwatches. Lamm also designed detailed getaway maps he called "gits," charting back roads ("cat roads") to a tenth of a mile. Before a heist, he obtained a nondescript, high-powered car and often hired drivers with racing experience. A chart on the dashboard showed block-by-block escape routes, alternative turns, and speedometer readings, with practice runs conducted under different weather conditions. Using this method, Lamm and his gang pulled off dozens of successful robberies from the end of World War I until 1930, stealing over $1 million total and earning a reputation as the most efficient bank-robbing crew of the era.
Lamm had multiple run-ins with the law under various aliases. In February 1927, he and an accomplice were arrested, and police uncovered his criminal history. A bond hearing revealed that under his real name, he had been arrested in San Francisco in December 1914 for robbery (case disposition unknown), and in Superior, Wisconsin, in June 1918 on suspicion of a holdup (he was told to leave after no connection was found). Under the alias "Harry K. Lamb," he was arrested in Kansas City, Missouri, in July 1918 but released. As "Thomas Bell," he was arrested in St. Joseph, Missouri, in December 1920 for burglary—this was the alias he was identified by at his death. In May 1929, he was arrested in Benton, Illinois, and linked to the robbery of the Northwestern National Bank of Milwaukee.
Lamm died on December 16, 1930, after a botched robbery in Clinton, Indiana. The gang stole $15,567 from the Citizens State Bank, but getaway driver W. H.
Quick Facts
- Birth Date
- 1890-04-19
- Birth Place
- Kassel, German Empire
- Death Date
- 1930-12-16
- Death Place
- Sidell, Illinois, United States
- Cause
- Suicide
- Other Names
- "Baron" Lamm · Harry K. Lamb · Robert J. Masden · Thomas Bell
- Charge
- Charge of robbery, 1914; suspicion of hold up, 1918; arrested for burglary, 1920; arrested 1927; arrested 1929
- Conviction
- Grand larceny
- Conviction Penalty
- Imprisonment in 1917
- Occupation
- Former member of the Prussian Army
Facts from the source article.
Lore & Background
Lamm was a member of the Prussian Army but was cashiered after being caught cheating at cards. He emigrated to the United States shortly before World War I in 1914. He became a holdup man and adapted his military training into crime, theorizing that a heist required all the planning of a military operation, including contingency options. He developed what became known as 'The Lamm Technique', which involved carefully studying a target bank for many hours, developing a detailed floor plan, noting the location of safes, and establishing escape routes. He occasionally had a man pose as a journalist to understand the bank's inner workings. Lamm assigned each gang member a specific job and zone, and put them through rehearsals using a full-scale mock-up of the bank.
Reader's Guide
Herman Lamm's significance lies in his transformation of bank robbery from an improvised, risky venture into a disciplined, military-style operation. His 'Lamm Technique' introduced systematic casing, detailed floor plans, assigned roles, rehearsals, and precise timing, as well as meticulously planned escape routes with backup options. This approach made his gang the most efficient of the era, netting over $1 million. By his death in 1930, the technique had already been widely imitated across the country. Infamous bank robber John Dillinger studied Lamm's system and used it extensively throughout his criminal career. Two of Lamm's surviving gang members, Walter Dietrich and James 'Oklahoma Jack' Clark, met Dillinger in prison and were permitted to join his gang on the condition they taught him everything they knew about the Lamm Technique. Lamm is widely considered one of the most brilliant and efficient bank robbers to have ever lived, and has been described as 'the father of modern bank robbery'.
Did You Know?
- Lamm was a former Prussian Army soldier who was cashiered for cheating at cards.
- He developed the Lamm Technique while serving a brief prison stint in Utah in 1917.
- He called his detailed getaway maps 'gits' and back roads 'cat roads'.
- His gang's final botched heist in 1930 involved four different vehicles, including a truck with little water in the radiator and a car with only one gallon of gas.
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