Before the reign of Maharaja Ranjit Singh the armies in Punjab were consisting purely of cavalry. As Ranjit Singh became the Sardar of Sukerchakia Misl The tried to unify with his conquests most of the Punjab. With clever diplomacy and many battles he gradually unified most of Punjab under him. However the Afghans, The British and the Gurkhas were still a very big threat, while his empire was still in its infancy. Therefore, in 1805, he started recruiting regular forces and employing East India Company deserters as officers or soldiers. This didn't went very well as most of these deserters were constantly in touch with the British. The British where alarmed with the rapid conquests of Ranjit Singh and sent many diplomatic missions to help the Phulkian sardars from a possible conquest of their lands and check the growing power of the Sikh Sovereign. A Muslim regiment under Charles Metcalfe, 1st Baron Metcalfe was sent to Amritsar for talks with the Maharaja. The soldiers created noise through their chants as they approached Ranjit Singh’s fort in Amritsar and passed near the Golden Temple and caused an irregular detachment of Nihang guards to inquire about the disturbances during prayer, before they were challenged by the Muslim soldiers who fired upon them. The Sikh Nihangs shot off many Musket and matchlock volleys rather than a sword charge. It resulted in the death of many of Metcalfe's escorts, while others were wounded. This impressed Ranjit Singh and left a deep impact on him, as the Nihangs had quickly adopted the line formations of Metcalfe's escorts and then shot off their volleys. The Maharaja then accepted The Treaty of Amritsar, and saw the British as allies for the moment as he took the British refusal to engage after the assault on Metcalfe's convoy as well as the Sikh army's frequent unanswered incursions and attacks south of the Sutlej on British army officers in Ludhiana as signs of weakness on the British's part.
Formation
It was the Maharaja Ranjit Singh who started to hire European officers to train and command parts of his army. It started in 1805 and continued to grow until 1839.
Infantry
Ranjit Singh was fully aware of the importance of infantry. The task of recruitment in this army had started after 1805, which continued throughout his reign. In the beginning, the number of Sikhs in this army was nominal. The reason being that the Sikhs looked down upon infantry. Therefore, in the beginning, Ranjit Singh recruited some Pathans and Gurkhas in this section of his army. Afterwards, owing to Ranjit Singh's efforts, Sikhs too began to join it. In 1822, he employed GeneralJean-Baptiste Ventura to train the infantry in western pattern. Under his guidance, the infantry became the most disciplined army of within a few years. By 1838-1839 the strength of the infantry had risen to 45,000. It was divided into battalions, companies and sections. Each battalion consisted of 800 soldiers. It was put under a Commandant. Each battalion was divided into eight companies. Each company was put under a Subedar. Each company was divided into 4 sections. Each section consisted of 25 soldiers. It was put under a Jamadar. The Fauj-i-Khas, was also part of the Fauj-i-Ain. It consisted of the elite soldiers of the Sikh Khalsa Army. It had a separate emblem and harsh training.
Cavalry
The second most important part of the army was cavalry. In order to organize it on western lines, Ranjit Singh appointed General Jean-Francois Allard. Under his command, the cavalry became very strong. In 1838–39, the overall strength of the cavalry was 10,000. The cavalry was divided into regiments. Each regiment consisted of 250 to 600 cavaliers. The regiments were further divided into risalas. Each Risala consisted of 150 to 250 cavaliers. The officers and other non-combatants of cavalry were similar to those of infantry. The pay of the cavalry was, however, higher than that of the infantry.
Artillery
I was fully aware of the importance of artillery in the modern warfare. Therefore, he paid a special attention to the development of artillery in 1810. In 1812 he employed General Claude Auguste Court and Colonel Alexander Gardner in 1832 and organized Topkhana-i-Khas. Under their able guidance the artillery made matchless progress in a few years. Maharaja Ranjit Singh divided his artillery into four categories:
Topkhana-i-Fili: Heavy cannons pulled by elephants
Topkhana-i-Shutri consisted of those guns which were pulled by camels.
Topkhana-i-Aspi consisted of light guns pulled by horses
Topkhana-i-Gavi consisted of medium cannons pulled by oxen
The artillery was divided into batteries or deras. Each battery consisted of 10 guns and 250 gunners. Each battery was under a commandant. The batteries were further divided into sections. Each section compromised 2 guns and 8 to 10 gunners. Each section was under a Jamadar. The entire artillery was under a General. In 1838-39, the strength of the Sikh artillery was 182 heavy cannons, 20 Howitzers, and 60 light cannons. It had at least 5,000 gunners.