When did the little rock nine take place?
When integration began in September 4, 1957, the Arkansas National Guard was called in to "preserve the peace". Originally at orders of the governor, they were meant to prevent the black students from entering due to claims that there was "imminent danger of tumult, riot and breach of peace" at the integration. However, President Eisenhower issued Executive order 10730, which federalized the Arkansas National Guard and ordered them to support the integration on September 23 of that year, after which they protected the African American students.
When did the attempt at integration begin for the  little rock nine?
September 4, 1957
Little Rock Nine
No context provided
When did the little rock nine's admission take place?
September 1957
Little Rock Nine
https://en.wikipedia.org/wiki/Little%20Rock%20Nine
The Little Rock Nine was a group of nine African American students enrolled in Little Rock Central High School in 1957. Their enrollment was followed by the Little Rock Crisis, in which the students were initially prevented from entering the racially segregated school by Orval Faubus, the Governor of Arkansas. 
Little Rock Nine
The integration of Little Rock Central High School with the admission of nine African American students took place in September 1957. The integration was first attempted on September 4, 1957, but was prevented by Arkansas Governor Orval Faubus until President Eisenhower ordered the National Guard to support the integration and escort the students on September 23.