In Detroit, where Mrs. Roberts' home was before her marriage, with her husband arrived to spend the Christmas holidays. The Mexican armies are again in clash, with the Carranzistas advancing in the direction of Chihuahua. General Murgia is rushing reinforcements to the relief of General Ozuna's cavalry. United States agents learned today that the cavalry entered a trap arranged by the bandits. The Villa's headquarters are at Bustillos. Military men here believe that Villa is in the hands of the bandits.  merely endeavoring to hamper the Carrauzista pursuit after him, and that he does not intend to attack Chihuahua City again. In anticipation of an attack, however, General Murgia is digging new trenches and placing barbed wire entanglements about Chihuahua. It has been reported and rumored that Villa has announced his intention of again entering the city, and taking 200,000 pesos ransom. 