The period from the creation of the Khalsa (1699 A.D.) to the death of Guru Gobind Singh Ji (1708 A.D.) is called Post Khalsa period. During this period, Guru Sahib remained busy in fighting battles. The following are the battles fought by Guru Gobind Singh ji :

(1).The First Battle of Anandpur 1701 A.D. :

After two years of the creation of the Khalsa, Guru Gobind Singh Ji had to declare war against the Kings of hill states. The main cause of this battle was that the kings of hill states became nervous by the creation of the Khalsa. The principles of the Khalsa were also against the religion of the Kings of hill states. So Bhim Chand the ruler of Bilaspur asked Guru Sahib to either have Anandpur Sahib or pay appropriate rent for it. Guru Sahib rejected his demand. As a result, in 1701 A.D. armies of Bhim Chand and other Kings of hill states besieged Anandpur Sahib. Guru Sahib, Sahibzada Ajit Singh (14-15 years old) and other Sikhs made the enemies suffer a great loss. As a result, the disappointed Kings of hill states wanted to enter into an agreement with Guruji. Guruji who also did not want to fight with them made the agreement. According to the agreement, Guruji left Anandpur Sahib and went to stay at Nirmoh near Kiratpur Sahib.

(2). The Battle of Nirmoh, 1702 A.D. :

Bhim Chand realised that it was impossible to finish the power of the Sikhs. He asked for the help of the Mughal, government to finish their power. As a result, in the beginning of 1702 A.D, on one side the army of Bhim Chand and on the other side the Mughal army under the leadership of subedar of Sirhind attacked Nirmoh. The Gujjars staying nearby helped the invaders. On the other hand, Guru Gobind Singh Ji and his Sikhs got ready for war. The Sikhs fought the enemies bravely. The battle continued for a night and a day. At last, Guruji defeated the army of the enemy and forced them to flee.

(3). The Battle of Satluj, 1702 A.D. :

Although Guruji won the battle of Nirmoh, yet he decided to leave Nirmoh. He had not yet crossed the river Satluj that the enemy attacked him again. The army of Guruji fought against the enemy valiantly. The battle continued for four hours. Guruji won this battle also.

(4). The Battle of Basauli, 1702 A.D. :

After crossing the river Satluj, Guruji and the Sikhs went to Basauli. The army of Bhim Chand chased the army of Guruji but Guruji again defeated them. Since the rulers of Basauli and Jasvan were Guruji’s friends, therefore, Bhim Chand thought it useful to have a treaty with Guruji. The treaty was signed in the middle of 1702. As a result, Guruji again came to Anandpur Sahib. Guruji did not have to fight any battle for the next two years.

(5). The Second Battle of Anandpur Sahib, 1704 AD. :

The Kings of hill states began to feel jealous on watching the increasing power of Guruji. The federation established by them asked Guruji to leave Anandpur Sahib. When Guruji rejected their demand, they attacked him but Guruji defeated them and forced them to return.

Bhim Chand and other Kings of hill states asked help from the Mughal Government. The Fauzdar of Sirhind, Wazir Khan came there with his army. Wazir Khan, Kings of hill states and Ranghars together attacked Guruji. The Sikhs from inside the fort failed the enemy's attack. Then the enemy besieged Anandpur Sahib on all sides. As a result, it became impossible for the Sikhs to continue the battle. The Sikhs wanted to leave Anandpur Sahib but Guruji did not agree. So forty Sikhs wrote ‘Bedawa’ a disclaimer and left the company of Guruji. At last, at the instance of Mata Gujri, Guruji left Anandpur Sahib on December 21, 1704 A.D.

(6). The Battle of Shahi Tibbi :

As soon as the enemy came to know about Guru Gobind Singh Ji having left Anandpur Sahib, they captured Anandpur Sahib. They chased the Sikhs. Guruji ordered his Sikh Uday Singh to resist the enemy. He along with his 50 companions resisted a huge army of the enemy at Shahi Tibbi. Although all the Sikhs were martyred, yet they killed hundreds of enemies.

(7). The Battle of Sirsa :

When Guru Sahib and his companions reached the river Sirsa, the enemy also approached near them. Guruji left his main Sikh Bhai Jiwan Singh Rangreta (who had brought head of Guru Teg Bahadur Ji from Delhi and reached Kiratpur Sahib and whose earlier name was Bhai Jaita) along with about hundred Sikhs tried to resist the enemy. They resisted the enemy valiantly. In the battle, the enemy suffered heavy losses. At that time the Sirsa river was in flood. Guruji hundreds of his Sikhs and companions, along with the horses jumped into the river. Many Sikhs were drowned. A lot of valuable literature was also washed away. In this confusion many Sikhs and two younger Sahibzadas, Zorawar Singh and Fateh Singh along with Mata Gujri Ji were seperated from him.

(8). The Battle of Chamkaur Sahib, 1705 A.D. :

After crossing the river Sirsa, Guru Gobind Singh Ji, some of his Sikhs and his elder sahibzadas, Ajit Singh Jujhar Singh reached Chamkaur Sahib via Ghanola and Kotla Nihang. At that time he had only forty Sikhs with him. There, they took refuge in a ‘Kachhi Garhi’. When the enemy attacked them, they resisted them valiantly. Both the Sahibzadas of Guru Sahib gave a proof of their bravery. At last they both became martyrs. While resisting the enemy valiantly, three out of the five ‘Panj Piaras- Sahib Singh, Mohkam Singh and Himmat Singh were also martyed. At Iast Guruji was left with only five out of forty Singhs. They forced Guruji to leave Chamkaur Sahib in form of Hukam urged by a Hukamnama (written or spoken letter giving some order) issued by them. Bhai Daya Singh and Bhai Dharam Singh came out of the Garhi with him. Other Singhs became martyrs while fighting.

Guru Gobind Singh Ji reached Khidrana via plains of Machhiwara, Alamgir, Dina Kangar etc.

(9). The Battle of Khidrana, 1705 A.D. :

When Guru Gobind Singh Ji reached the Dhab of Khidrana a large number of Sikhs had joined him. The Singhs who wrote Bedawa and left Guruji also reached there. Mai Bhago specially reached there along with them to fight in favour of Guruji. Guruji had about 2000 Sikh soldiers at that time. On the other side, Wazir Khan, Subedar of Sirhind with a huge army of 10,000 soldiers reached there. A fierce battle took place at Dhab of Khidrana on December 29, 1705. In the battle, Guru Sahib and his companions gave a proof of extraordinary courage. They fought valiantly .Due to the scarcity of water it was difficult for Mughals to fight the battle. As a result, the Mughals had to flee after defeat. Although Mai Bhago was badly wounded and all forty Singhs who wrote Bedawa also became martyrs yet Guruji won the last battle Guruji keeping in view their bravery tore Bedawa in front of their leader Bhai Mahan Singh. Those Sikhs are remembered in the history as ’40 Muktas’. In their memory, Khidrana was named Muktsar.

Conclusion :

Wazir Khan, a Muslim army commander and the Nawab of Sarhandh ,against whose army the Guru had fought several wars,commissioned two Afghans, Jamshed Khan and Wasil Beg, to follow the Guru's army as it moved for the meeting with Bahadur Shah, and then assassinate the Guru. The two secretly pursued the Guru whose troops were in the Deccan area of India, and entered the camp when the Sikhs had been stationed near river Godavari for months.They gained access to the Guru and Jamshed Khan stabbed him with a fatal wound at Nanded.Some scholars state that the assassin who killed Guru Gobind Singh may not have been sent by Wazir Khan, but was instead sent by the Mughal army that was staying nearby.The Guru died of his wounds a few days later on 7 October 1708. His death fuelled a long and bitter war of the Sikhs with the Mughals.After that the struggle continued by Banda Singh Bahadur along with Baj Singh, Binod Singh and others.