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In page Korean War:

"

By 1948, a North Korea-backed insurgency had broken out in the southern half of the peninsula.[citation needed] This was exacerbated by the undeclared border war between the Koreas, which saw division-level engagements and thousands of deaths on both sides.[1] The ROK was almost entirely trained and focused on counterinsurgency, rather than conventional warfare. They were equipped and advised by a force of a few hundred American officers, who were successful in helping the ROKA to subdue guerrillas and hold its own against North Korean military (Korean People's Army, KPA) forces along the 38th parallel.[2] Approximately 8,000 South Korean soldiers and police officers died in the insurgent war and border clashes.[3]