Solution:The Subsidiary Alliance System was not established during the tenure of Lord Dalhousie, but this event took place during the term of Lord Wellesley. The following events took place during the tenure of Lord Dalhousie-1. Establishment of the Doctrine of Lapse,
2. The beginning of the first telegraph line,
3. Construction of the first railway line,
4. Sir Charles Wood's Dispatch on Education,
5. Establishment of Public Service Department,
6. First circulation of postage stamps
The Widow Remarriage Act, of 1856 was drafted by Lord Dalhousie, whereas it was passed and enforced during the tenure of Lord Canning