A trial is novv progressing in the United States Court for this District, (Judge McLean presiding,) which is creating a good deal of interest by reason of lts important relation to the law relative to the re-capture of runaway slaves. The suit is brought against several of the most influential men of Marshall, in this State, for opposing the re-taking of several fugitive slaves in that village during the winter of 1847, by the authorized agent of their owner, a citizen of Kentucky. She opposition is alleged to have been so great on the part of these citizens as to have resulted in the flight of the slaves from the village, and a consequent loss of their value, which is estimated at $2,800. Suit is brought against tho Defendants for the recovery of this amount, in the name of the owner. The principal witness for the Plaintifl was the person wlio attempted the recovery of the slaves, and he was kept on the stand for the space of 29 hours. The testimony is yet progressing, and the trial bids fairto continue for a week to come. Somo of our most eminent counsel have been retained by the Defendants, while the Prosecution is conducted by Mr. Prattt, of Marshall, assisted by John Novell, Esq,, U. S. District Attorney. - This being the first time, if we mistake not, that a queation of this kind has arisen within the limits of our State, the result is looked forward to with a good deal anxiety especially by that portion of the community who are desirous of rendering just as small an amount of assistance to slaveholders who come among us without incurring the penalty of the law. [Detroit Advertiser.] A meeting of the citizens of this place has boen called, to sympathize with, and contribute to sustain, those individuals now under arrest for assisting a colored family to make tlieir escape, when about to be re-captured, and taken back to the South; where, after suffering the cruel penalties which those poor fugitives from slavery, when recovered, are destined to undergo, they were to drag out a miserable existence, to which death would be preferable. We earnestly recommend to the friends of freedom in every neighborhood throughout the State, without respect to party to meet and manifest their sympathy, and, if so disposed, to contribute to assist in defraying the enormous expense of this suit. Most certainly, those men, who so nobly and practically defended the rights of the slave, ought to be sustained by all who profess to remember the colored man's wrongs.