[6] In return for his loyalty to the invader, the East India Company made Tej Singh Raja of Sialkot.

[1] After proving his worth as a soldier during the invasions of Kashmir in 1813, 1814, and 1819, alongside the operations against Mankera, Leiah, and Derajat, he was promoted to the rank of general in the Sikh army in 1818.

[9] After the death of Maharaja Ranjit Singh, the Sikh court became fractious and the various agents acted at cross purposes to each other.

However, Rani Jindan, the Regent acting on behalf of the anointed prince Duleep Singh, ordered him to march the troops against the British.

[5] According to Harbans Singh writing in The Encyclopedia of Sikhism, his actions and commands during both Anglo-Sikh Wars was "marked by duplicity" and that he had "established secret liaison with the British".

[1] In the Battle of Sobraon fought on 10 February 1846, General Tej Singh crossed a pontoon bridge on the Sutlej river and ordered its destruction.

According to historian Amar Pal Sidhu, this incident led to the defeat of the Sikh Army, possibly as intended by Tej Singh.

[1] Whilst in retreat, he ordered troops under his command to destroy boats and a tete de pont (bridgehead) to hamper the withdrawal of Sikh forces and dooming them.

[1] After the defeat of Sikhs, the Treaty of Lahore was signed by which Kashmir was sold to Gulab Singh to pay war indemnities to the British as well as the army was regulated.