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The battles climaxed Tuesday with seven assaults against army positions that left 18 attackers dead across Nuevo Leon and Tamaulipas.
The first came when gunmen ambushed soldiers on patrol between Matamoros and the border city of Reynosa, across from McAllen, Texas. An hour later, cartel gunmen used trucks and cars to blockade a garrison in Matamoros and the main army base in Reynosa.
Troops were ambushed six more times throughout the region, including once in Reynosa when soldiers rushed to check reports of another blockade near the offices of Mexico's state oil company. In each of the two deadliest battles, five gunmen were killed.