Short answers, pulled from the story.
The Battle of Vimeiro took place on the 21st of August 1808. General Arthur Wellesley commanded British forces near the village of Vimeiro with 20,000 men against French troops under Major-General Jean-Andoche Junot.
General Arthur Wellesley commanded the British army during the Battle of Vimeiro. His force included eight independent infantry brigades led by Rowland Hill and Ronald Craufurd Ferguson. Sir Harry Burrard and Sir Hew Dalrymple later arrived to supersede Wellesley's command.
British forces numbered 20,000 men while French forces under Major-General Jean-Andoche Junot totaled only 14,000 men. The French brought 23 cannons into battle compared to the British 17 artillery pieces.
Under the terms of the Convention of Cintra signed shortly after the battle, the defeated French army was transported back to France by the British navy. The agreement allowed the French to retain their equipment and escape intact despite the military victory.
Sir Harry Burrard declined to interfere with the subsequent French retreat and Sir Hew Dalrymple arrived soon after to take command. Senior officers refused to pursue the fleeing enemy despite General Arthur Wellesley urging pursuit because they were superseded by these commanders.