DEAR SIR,--Sufficient companies have been formed in Indiana or nearly so to fill the six Regiments of our state. They of course contain all classes of persons, but many of them are our _best_ and _dearest_ youths with whom it has cost many a sigh and burning tear to part. Thousands more will soon be made ready to join. We are now of course intensely anxious about the Commandants and suppose that the President will have the appointment of those officers, and my object in writing this is to request you _without fail_ to see the President and General Cameron and say to them that we are all sensitive upon the appointments of the Brigadier General of this state, and say to them that the appointment of a mere civilian will give extreme dissatisfaction not only to the troops but to their friends. I name no person of that character who is an aspirant but I regret to say that there are some of that character here. From the appointment of one of whom, may God in his infinite mercy save us. I believe every man in our State will arm, and those who refuse will be hung and their property confiscated. There is a feeling all through the State of the most intense character, wholly indescribable. I can do nothing of business. I am now helping our 200 men off, encouraging and counselling them what I can. Unless some change in my feelings now strained to the utmost pitch, I shall not be far behind them. Our boys are taking the oath in the Hall of the House, and the telegraph brings intelligence of the fighting at Baltimore and the burning of Harper's Ferry. The boys take the oath with a look of determination to do or die. All our fears now are for Washington. May God preserve you until succor comes. Ever yours, J. P. USHER. I am so excited that I can scarcely write legibly, but say to the President that the _entire power_ of Indiana with all its men, women and children, money and goods, will be sacrificed if necessary to sustain the government; the treachery of Virginia only intensifies the feeling. J. P. U. TERRE HAUTE, INDIANA, May 5, 1861. W. H. LAMON, Esq.: