During the Counter-Insurgency under the Japanese Occupation since 1942 to 1945 after the Japanese Invasion, many local Igorot and Cordilleran guerrillas was the fighting siege and invasions around the plains in Kalinga-Apayao in Mountain Province from the few months and three years and aiding the Allied local Filipino military forces of the Philippine Commonwealth Army units under the U.S. Command and including the Philippine Commonwealth Army 1st, 2nd, 12th, 13th, 15th and 16th Infantry Division and the USAFIP-NL 11th, 14th and 15th Infantry Regiment was fought side by side against the Japanese Imperial forces, the Axis local Filipino collaborating military forces of the Bureau of Constabulary units under the Japanese Command and the Makapili collaborating rebel fighters and beginning the First Battle of Kalinga-Apayao from 1942 to 1944.

The aftermath of the First Battle of Kalinga-Apayao on 1944, local Philippine Commonwealth military forces and the Igorot and Cordilleran guerrilla resistance is the couple of three years and resulted of the Allied retreated and captured by the Japanese Imperial forces, the Axis local Filipino military forces of the Bureau of Constabulary units under the Japanese Command and the Igorot and Cordilleran Makapili rebel fighters in Kalinga-Apayao before the Liberation. The U.S. military forces returned in Luzon and the local Filipino military forces under the Philippine Commonwealth Army and Philippine Constabulary and the U.S. military forces under the United States Army and United States Army Air Forces was liberated and entering in Kalinga-Apayao, in Northern Mountain Province on 1944 to 1945.

Second Battle of Kalinga-Apayao

The beginning of the Allied Liberation from 1944 to 1945 after the counter-insurgencies under the Japanese occupation after the First Battle of Kalinga-Apayao on 1944 by retreating Filipino troops and Igorot and Cordilleran guerrilla resistance from the attacking Japanese Imperial armed forces, the Filipino collaborating troops and Makapili collaborating rebels around in Kalinga-Apayao in the part of Mountain Province.

Started the Second Battle of Kalinga-Apayao or Kalinga-Apayao Campaign on 1944 to 1945, local military forces of all stronghold of Filipino soldiers under the Philippine Commonwealth Army 1st, 2nd, 11th, 12th, 13th, 15th, 16th and 17th Infantry Division, the Philippine Constabulary 1st and 2nd Infantry Regiment and the USAFIP-NL 11th, 14th and 15th Infantry Regiment was recaptured and liberated in Kalinga-Apayao under the part in Mountain Province and aiding the Igorot and Cordilleran guerrilla resistance fighters and the U.S. military forces was defeated and fought side by side against the Imperial Japanese Army forces led by General Tomoyuki Yamashita. The sieges and invasion of the Military GHQ and Camp Base Garrison of the Imperial Japanese Armed Forces was battled and invading commands and they entered and capturing the local Filipino troops of the Philippine Commonwealth Army, Philippine Constabulary and the USAFIP-NL military units.

The couple of few months and two years during the liberated the battles and invaded in Kalinga-Apayao on 1944-1945, many Filipino soldiers, military officers, military trucks, tanks, military IFV,s, artillery and mortars and other military equipments under the Philippine Commonwealth Army, Philippine Constabulary and the USAFIP-NL military units was fought around side by side by the battles, sieges and invading commands from the plains, rivers and forests and they around the roman catholic churches, city and municipal town plazas, provincial town plazas, city and municipal towns, province capitols, villages and many others are bombed and destroyed to defeated and attacking Japanese Imperial armed forces and they captured in Kalinga-Apayao in Northern Mountain Province by the stronghold Filipino troops.

The American liberation military forces under the United States Army and the United States Army Air Forces entered in Kalinga-Apayao continue and liberated the battles, sieges and invading commands and aided to supported by the local Filipino military forces under the Philippine Commonwealth Army, Philippine Constabulary and the USAFIP-NL military units including the Igorot and Cordilleran guerrilla resistance fighters and defeated Japanese soldiers.

The aftermath of the Second Battle of Kalinga-Apayao on 1945, the combined U.S. and Philippine Commonwealth military and the Igorot and Cordilleran guerrilla resistance casualties during the fighting and they succeeding battles, sieges and invading commands including of over 7,000 Filipino troops under the Philippine Commonwealth Army, Philippine Constabulary and the USAFIP-NL military units killed in action and over 16,400 wounded in action, the American soldiers of the United States Army units over 5,200 killed in action and over 14,000 wounded in action, while the Igorot and Cordilleran guerrillas suffered over 2,000 killed in action and over 4,200 wounded in action, the Japanese Imperial Army forces over 34,000 killed in action, 56,000 wounded in action and over 11,000 captured in action and the Makapili rebels over 2,000 killed in action, 5,100 wounded in action and over 500 captured in action.

The combined U.S. and Philippine Commonwealth military ground forces including the Igorot and Cordilleran guerrilla resistance was saluted and successfully victories after the battle and fighting and they captured in Kalinga-Apayao, Mountain Province. Before the surrender of the Imperial Japanese Armed Forces under by General Tomoyuki Yamashita by the combined U.S. and Philippine Commonwealth ground troops at Kiangan, Mountain Province (now, Kiangan, Ifugao) on September 2, 1945 after the Second World War under the Japanese Occupation.

World War II under the Japanese Occupation

• December 1941 - Japanese bomber and fighter planes was invaded in Kalinga-Apayao from the part of northern Mountain Province during the Japanese invasion.

• 1942 - The occupied by the Japanese Imperial forces and entered in Kalinga-Apayao from the part of northern Mountain Province during the Japanese occupation. The military garrison base of the Imperial Japanese Armed Forces was they established.

• 1942 - The built of the military general headquarters and camp bases of the Philippine Commonwealth Army was founding establishment and they active from 1942 to 1946 was stationed in Kalinga-Apayao. Started the First and Second Battle of Kalinga-Apayao on 1942 to 1945 between the local Filipino troops and Igorot resistance against the Japanese.

• 1942 - The built of the military general headquarters and camp bases of the 11th, 14th and 15th Infantry Regiment of the United States Armed Forces in the Philippines - Northern Luzon (USAFIP-NL) was a military unit organization and founded from 1942 to 1946 and stationed in Kalinga-Apayao. Started the First and Second Battle of Kalinga-Apayao on 1942 to 1945 between the local Filipino troops and Igorot resistance against the Japanese.

• October 14, 1943 - The founding declaration of the Second Republic of the Philippines from the collaboration of the Empire of Japan
  Empire of Japan
  The Empire of Japan is the name of the state of Japan that existed from the Meiji Restoration on 3 January 1868 to the enactment of the post-World War II Constitution of...
  
  . Jose P. Laurel
  Jose P. Laurel
  José Paciano Laurel y García was the president of the Republic of the Philippines, a Japanese-sponsored administration during World War II, from 1943 to 1945...
  
  was inaugurated as a former president of the Second Republic for the collaborated from the Japanese. President Laurel was starting declared by the ongoing First Battle of Kalinga-Apayao between fought the main battles of local Philippine Commonwealth troops and Irogot resistance against the Japanese Imperial forces, local collaborating troops of the Bureau of Constabulary and the Makapili militia force.

Post-War Era

• July 04, 1946 - The establishment of the second declaration of independence of the Republic of the Philippines from the United States of America.