Some context: The Khmer Krom (Khmer: khmaerkroom, Vietnamese: Kho Me Crom) are ethnically Khmer people living in the south western part of Vietnam, where they are recognized as one of Vietnam's fifty-three ethnic minorities. In the Khmer language, Krom means "lower" or "below", as it refers to an area of 89,000 square kilometres (34,363 sq mi) around modern day Saigon and the Mekong Delta, which used to be the southeasternmost territory of the Khmer Empire until its incorporation into Vietnam under the Nguyen lords in the early 18th century. This marks the final stage of the Vietnamese "March to the South" (nam tien).
Khmer nationalist Son Ngoc Thanh (1908-77) was a Khmer krom, born in Tra Vinh, Vietnam. Thanh was active in the independence movement for Cambodia. With Japanese support he became the prime minister of Cambodia in March 1945 but was then quickly ousted with the return of the French later that year. Widely supported by the Khmer Krom during the First Indochina War, Thanh's role faded in Vietnam after 1954 as he became more embroiled with politics in Cambodia proper, forming an opposition movement against Prince Sihanouk.  During the Vietnam War and direct American involvement between 1964 and 1974, the Khmer Krom were recruited by the United States Armed Forces to serve in MIKE Force. The force fought on the side of South Vietnam against the Viet Cong but in time the militia regrouped as the "Front for the Struggle of Kampuchea Krom" (French: Front de Lutte du Kampuchea Krom). Headed by a Khmer Krom Buddhist monk, Samouk Sen, the group was nicknamed the "White Scarves" (Khmer: Kangsaing Sar; Vietnamese: Can Sen So) and allied itself with FULRO against South Vietnam. FULRO was an alliance of Khmer Krom, Montagnard, and Cham groups.  The anti-Communist prime minister of the Khmer Republic (1970 - 1975) Lon Nol planned to recapture the Mekong Delta from South Vietnam.  After the Fall of Saigon in 1975 and the Communist take-over of all of Vietnam, the Kampuchea Krom militia found itself embattled with People's Army of Vietnam. Many of the fighters fled to Khmer Rouge-controlled Democratic Kampuchea hoping to find a safe haven to launch their operations inside Vietnam. The "White Scarves" arrived in Kiri Vong District in 1976, making overture to the Khmer Rouge and appealing to the leader Khieu Samphan directly for assistance. The force was disarmed and welcomed initially. Subsequent orders from the Khmer Rouge leadership however had Samouk Sen arrested, taken to Phnom Penh, tortured, and killed. His force of 67 Khmer Krom fighters were all massacred. During the following months, some 2,000 "White Scarves" fighters crossing into Kampuchea were systematically killed by the Khmer Rouge.  In the late 1970s, the Kampuchean Revolutionary Army attacked Vietnam in an attempt to reconquer the areas which were formerly part of the Khmer Empire, but this military adventure was a total disaster and precipitated the invasion of Democratic Kampuchea by the People's Army of Vietnam and subsequent downfall of the Khmer Rouge, with Vietnam occupying Kampuchea.
were they successful?
A: this military adventure was a total disaster
Some context: Mastodon is an American heavy metal band from Atlanta, Georgia, formed in 2000. The group is composed of bassist Troy Sanders, guitarists Brent Hinds and Bill Kelliher, and drummer Brann Dailor, all of whom perform vocals in studio (with the exception of Bill Kelliher). They all perform vocals at live shows. Their musical style features progressive concepts and unique instrumentation.
The band's second full-length album, Leviathan, was released in 2004. It is a concept album loosely based on Herman Melville's novel Moby-Dick. The band received critical acclaim for Leviathan and the record was named album of the year by Kerrang! and Terrorizer. "Blood and Thunder" which featured Clutch vocalist Neil Fallon was chosen as one of the most important recordings of the decade by National Public Radio in November 2009, and that the entire album epitomizes " a phenomenal decade for metal". Leviathan also ranked second in a list by Metal Hammer of the best albums of 2004.  The band went on tour in support of the album, playing throughout North America and Europe in The Unholy Alliance tour along with Slayer and Lamb of God and later on with Slipknot.  "Iron Tusk", the fifth track on the album, can be found on the soundtrack of the skateboarding video game Tony Hawk's American Wasteland and in 2K Sports video game NHL 2K9. "Blood and Thunder" is featured in the video games Need for Speed: Most Wanted, Project Gotham Racing 3, and Saints Row. "Blood and Thunder" was added as a playable track on all instruments in Guitar Hero: Metallica and was featured in Japanese music games Drummania V2 and Guitarfreaks V2. It has also been released as downloadable content for Rock Band 3, with Pro Guitar support also available at extra cost.  Leviathan was followed by the 2006 release of Call of the Mastodon, a remastered collection of the band's first nine songs, and a DVD of interviews and concert footage called The Workhorse Chronicles that includes material from the band's early days as a five-piece. The band has stated that "Call of the Mastodon" is their third studio album even though the album is a compilation album. These two releases were the band's last for Relapse Records, as they would later go on to sign with Warner Bros. Mastodon also recorded a cover version of Metallica's "Orion" for a 2006 Kerrang! tribute album marking the twentieth anniversary of the release of Master of Puppets.
Did they collaborate with any other artists?
A:
Blood and Thunder" which featured Clutch vocalist Neil Fallon