At 3:30 a.m. on Saturday, August 7, the Royalist army departed Motavita and continued their march towards Santa Fe. From Motavita they marched down the Samaca road with the intention of rejoining the main
Camino Real (Royal Road to Santa Fe) at the Casa de Teja or Casa de Postas where the road formed a Y shape as both the Samaca road and Camino Real converged and became a single road that crossed the Boyacá Bridge. The Boyacá Bridge was an important bridge that was part of the
Camino Real de Santa Fe, where it crossed the Teatinos River which was swollen at this time of year as a result of winter rain season. The distance to the bridge was only 25 km which the Spanish completed in 7 hours 30 minutes, at an average pace of 18 minutes per kilometer. Early morning that same day at 7 am, Bolivar left Tunja and took up an observation point at the San Lazaro heights near Tunja, from there around 9 am he spotted the Royalist Army and was able to deduce the route that they were taking. A little after 10 through Colonel Manuel Manrique he ordered that Upon receiving this order, General Santander's Vanguard Division set out from
Tunja toward Casa de Teja on the
Camino Real with Anzoátegui's Rearguard Division following suit. Since 7am the Patriot army had been assembled in the central plaza of Tunja ready to move out at a moments notice, the bridge lay some 16km from Tunja, the Patriot army completed this in around 4 hours of marching. Between the hours of 12 to 1pm a fraction of the Royalist vanguard which was composed of the 2nd and 3rd Numancia infantry battalions along with some dragoons under the command of Colonel Francisco Jiménez arrived and took up position near the Casa de Teja, from where they could observe the bridge. Jiménez observing that there was no presence of patriot forces in the vicinity allowed his troops to rest and ordered that lunch rations be served. Shortly before 2:00 p.m., patriot Captain Andres Ibarra and his forces spotted the Casa de Teja and the vanguard of the Spanish Army. The Spaniards spotted him too and the two exchanged fire, with Jimenez ordering his men to follow and engage what he believed was only a small observation force. 20 royalists chased after the Patriot force but later returned when they realized that this was a bigger force. General Santander who came marching down the
Camino Real with the rest of the patriot vanguard upon seeing this unfold ordered Lieutenant Colonel
Joaquín París commander of the
Cazadores Battalion to attack the Royalist forces at the Casa Teja. The Spanish vanguard was forced to fall back to river and crossed the strategic bridge over the Teatinos River and took defensive positions there. Meanwhile, the full vanguard of the Patriot army under Santander had reached Casa de Teja. The two vanguards now found themselves on opposite sides of the river, with this Santander then ordered Colonel Antonio Bejar to take some forces down the river and cross it in order to attack the Spanish vanguard from the rear. The Spanish rearguard was still several kilometers behind, so General Anzoátegui ordered to block the way between the vanguard and the rearguard of the Spanish forces. The rearguard, outnumbered, retreated to a small hill close to Casa de Teja. Anzoátegui then ordered a flank attack on the Spanish rearguard: battalions Barcelona and Bravos de Paez were to attack on the right side while the Legion Britanica and Rifles Battalion attacked on the left. The British Legion was a special forces squad composed of British and Irish people, which aided the revolutionary army in certain key battles for independence in South American countries. Unable to cross the river the Spanish assumed battle positions by the Casa de Teja: in the center they positioned three artillery pieces surrounded by the King's 1st infantry battalion to the left and the King's 2nd infantry battalion on the right, and on the wings, the Mounted Grenadiers and Dragoon cavalry units.
Arthur Sandes commander of Rifles Battalion charged the royalist artillery. This charge disrupted the arming of the 3 artillery pieces the Spanish possessed (they had transported them unassembled) only one of them was able to be assembled which allowed it to fire 3 shots before the gun carriage that supported it broke rendering it useless. Outnumbered, the Spanish rear guard began to retreat without any clear direction. Therefore, Bolívar ordered lancers units to attack the center of the Royalist infantry, the 3rd and 5th companies of the Granadan Dragoons charged the Patriot cavalry however the patriot cavalry conducted a turn face maneuver causing the dragoons to retreat as the patriot lancers had longer lances than they did. The other Spanish cavalry squadron the Mounted Grenadiers, ran away from the battle via the road towards Samaca. The charge of two patriot army cavalry squadrons caused panic amongst the Spanish troops, who were formed up in a column to resist the attack, although they were given the order to perform a bayonet charge this was not carried out due to the panic and confusion. Barreiro and his officers tried in vain to contain the rout of their soldiers and dismounted from their horses which condemned them to easily be captured by their enemy. Meanwhile, one kilometer and a half behind Casa de Teja, Bejar's Patriot vanguard managed to ford the river and was approaching the rear of the Royalist vanguard force. Once it reached them, the vanguard forces engaged in battle, while this occurred Santander led a charge across the bridge by force, using bayonets. The Spanish forces fled, leaving on the bridge their leader, Colonel Juan Tolrá who was killed. As the assembly of enemy prisoners began, the battle was over shortly after 4:30 p.m have only lasted a little more than 2 hours. The Patriots only suffered 66 casualties in total with some 13 dead and 53 wounded, meanwhile Barreiro's III Division was effectively dismantled as a result of the battle suffering 100 dead, 150 wounded, and 1,600 captured. ==Aftermath==