Question: Robert Mitchum was born in Bridgeport, Connecticut in 1917 into a Norwegian-Irish Methodist family. His mother Ann Harriet Gunderson was a Norwegian immigrant and sea captain's daughter; his father James Thomas Mitchum was a shipyard and railroad worker of Irish descent. His older sister, Annette (known as Julie Mitchum during her acting career), was born in 1914. Their father James Mitchum was crushed to death in a railyard accident in Charleston, South Carolina in February 1919, when Robert was less than two years old and Annette was not yet five.

Mitchum arrived in Long Beach, California in 1936, staying again with his sister Annette, now going by the name of Julie. She had migrated to the West Coast in the hope of acting in movies. Soon, the rest of the Mitchum family joined them in Long Beach. During this time, Mitchum worked as a ghostwriter for astrologer Carroll Righter. His sister Julie convinced him to join the local theater guild with her. In his years with the Players Guild of Long Beach, Mitchum made a living as a stagehand and occasional bit-player in company productions. He also wrote several short pieces which were performed by the guild. According to Lee Server's biography (Robert Mitchum: Baby, I Don't Care), Mitchum put his talent for poetry to work writing song lyrics and monologues for Julie's nightclub performances.  In 1940, he returned to Delaware to marry Dorothy Spence, and they returned to California. He remained a footloose character until the birth of their first child James, nicknamed Josh. They had two more children: Chris and Petrine. Mitchum got a steady job as a machine operator with the Lockheed Aircraft Corporation.  Mitchum suffered a nervous breakdown (which resulted in temporary blindness), apparently from job-related stress. He sought work as an actor or extra in films. His agent got him an interview with Harry Sherman, the producer of Paramount's Hopalong Cassidy western film series which starred William Boyd; Mitchum was hired to play minor villainous roles in several films in the series during 1942 and 1943. In 1943 he and Randolph Scott were soldiers in the Pacific Island war film Gung Ho!  Mitchum continued to find work as an extra and supporting actor in numerous productions for various studios. After impressing director Mervyn LeRoy during the making of Thirty Seconds Over Tokyo, Mitchum signed a seven-year contract with RKO Radio Pictures. He was groomed for B-Western stardom in a series of Zane Grey adaptations.  Following the moderately successful Western Nevada, Mitchum was lent from RKO to United Artists for The Story of G.I. Joe (1945). In the film, he portrayed war-weary officer Bill Walker (based on Captain Henry T. Waskow), who remains resolute despite the troubles he faces. The film, which followed the life of an ordinary soldier through the eyes of journalist Ernie Pyle (played by Burgess Meredith), became an instant critical and commercial success. Shortly after making the film, Mitchum was drafted into the United States Army, serving at Fort MacArthur, California. At the 1946 Academy Awards, The Story of G.I. Joe was nominated for four Oscars, including Mitchum's only nomination for Best Supporting Actor. He finished the year with a Western (West of the Pecos) and a story of returning Marine veterans (Till the End of Time), before filming in a genre that came to define Mitchum's career and screen persona: film noir.

Using a quote from the above article, answer the following question: What caused the mental breakdown?
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Answer: 

Problem: Jose Julian Marti Perez (January 28, 1853 - May 19, 1895) was a Cuban National Hero and an important figure in Latin American literature. During his life, he worked as a poet, essayist, journalist, translator, professor, and publisher. He was very politically active, and is considered an important revolutionary philosopher and political theorist. Through his writings and political activity, he became a symbol of Cuba's bid for independence against Spain in the 19th century, and is referred to as the "Apostle of Cuban Independence."

January 12, 1895, the North American authorities stopped the steamship Lagonda and two other suspicious ships, Amadis, and Baracoa at the Fernandina port in Florida, confiscating weapons and ruining Plan de Fernandina (Fernandina Plan). On January 29, Marti drew up the order of the uprising, signing it with general Jose Maria Rodriguez and Enrique Collazo. Juan Gualberto Gomez was assigned to orchestrate war preparations for La Habana Province, and was able to work right under the noses of the relatively unconcerned Spanish authorities. Marti decided to move to Montecristi, Dominican Republic to join Maximo Gomez and to plan out the uprising.  The uprising finally took place on February 24, 1895. A month later, Marti and Maximo Gomez declared the Manifesto de Montecristi, an "exposition of the purposes and principles of the Cuban revolution". Marti had persuaded Gomez to lead an expedition into Cuba.  Before leaving for Cuba, Marti wrote his "literary will" on April 1, 1895, leaving his personal papers and manuscripts to Gonzalo de Quesada, with instructions for editing. Knowing that the majority of his writing in newspapers in Honduras, Uruguay, and Chile would disappear over time, Marti instructed Quesada to arrange his papers in volumes. The volumes were to be arranged in the following way: volumes one and two, North Americas; volume three, Hispanic Americas; volume four, North American Scenes; volume five, Books about the Americas (this included both North and South America); volume six, Literature, education and painting. Another volume included his poetry.  The expedition, composed of Marti, Gomez, Angel Guerra, Francisco Borreo, Cesar Salas and Marcos del Rosario, left Montecristi for Cuba on April 1, 1895. Despite delays and desertion by some members, they got to Cuba. They landed at Playitas, near Cape Maisi and Imias, Cuba, on April 11. Once there, they made contact with the Cuban rebels, who were headed by the Maceo brothers, and started fighting against Spanish troops. The revolt did not go as planned, "mainly because the call to revolution received no immediate, spontaneous support from the masses." By May 13, the expedition reached Dos Rios. On May 19, Gomez faced Ximenez de Sandoval's troops and ordered Marti to stay rearguard, but Marti separated from the bulk of the Cuban forces, and entered the Spanish line.

What happen after they got the weapons

Answer with quotes:
order of the uprising, signing it with general Jose Maria Rodriguez and Enrique Collazo. Juan Gualberto Gomez was assigned to orchestrate war preparations for La Habana Province,