Meanwhile, Barreiro was still in ignorance of Bolivar's arrival. Indeed, he had supposed the passage of the Cordillera at that season impossible. As soon, however, as he did learn of his enemy's proximity, he collected his forces and took possession of the heights above the plains of Vargas, thus interposing between the patriots and the town of Tunja, which, being attached to the independent cause, Bolivar was anxious to enter. The opposing armies met on the 25th of July, and engaged in battle for five hours. The patriots won, chiefly through the English infantry, led by Colonel James Rooke, who was himself wounded and had an arm shot off. Still, the action had been indecisive, and the royalist power remained unbroken. Bolivar now deceived Barreiro by retreating in the daytime, rapidly counter-marching, and passing the royalist army in the dark through by-roads. On August 5th he captured Tunja, where he found an abundance of war material, and by holding which he cut Barreiro's communication with Bogota, the capital. It was in rapid movements like these that the strength of Bolivar's generalship lay. Freed from the shackles of military routine that enslaved the Spanish officers, he astonished them by forced marches over roads previously deemed impracticable to a regular army. While they were manoeuvring, hesitating, calculating, guarding the customary avenues of approach, he surprised them by concentrating a superior force upon a point where they least expected an attack, threw them into confusion, and cut up their troops in detail. Thus it happens that Bolivar's actions in the field do not lend themselves to the same impressive exposition as do those of less notable generals. [=The Victory of Boyaca=]