I've always found the wording of this declaration to be awesome, grave, and powerful. That aside, if it is read thoroughly, and with a knowlege of events prior to, it can serve as a window. What do you get from this document? Try to be as neutral as you can.
"Marcus Lepidus, Marcus Antonius, and Octavius Caesar, chosen by the people to set in order and regulate the republic, do declare that, had not perfidious traitors begged for mercy and when they obtained it become the enemies of their benefactors and conspired against them, neither would Gaius Caesar have been slain by those whom he saved by his clemency after capturing them in war, whom he admitted to his friendship and upon whom he heaped offices, honours, and gifts; nor should we have been compelled to use this wide-spread severity against those who have insulted us and declared us public enemies. Now, seeing that the malice of those who have conspired against us and by whose hands Gaius Caesar suffered, cannot be mollified by kindness, we prefer to anticipate our enemies rather than suffer at their hands. Let no one who sees what both Caesar and ourselves have suffered consider our action unjust, cruel, or immoderate. Although Caesar was clothed with supreme power, although he was pontifex maximus, although he had overthrown and added to our sway the nations most formidable to the Romans, although he was the first man to attempt the untried sea beyond the pillars of Hercules and was the discoverer of a country hitherto unknown to the Romans, this man was slain in the midst of the senate-house, which is designated as sacred, under the eyes of the gods, with twenty-three dastardly wounds, by men whom he had taken prisoners in war and spared, while some of them he had named as co-heirs of his wealth. After this execrable crime, instead of arresting the guilty wretches, the rest sent them forth as commanders and governors, in which capacity they seized upon the public money, with which they are collecting an army against us and are seeking reinforcements from barbarians ever hostile to Roman rule. Cities subject to Rome that would not obey them they have burned, or ravaged, or levelled to the ground; other cities they have forced by terror to bear arms against the country and against us.
"Some of them we have punished already; and by the aid of divine providence you shall presently see the rest punished. Although the chief part of this work has been finished by us or is well under control, namely the settlement of Spain and Gaul as well as matters here in Italy, one task still remains, and that is to march against Caesar's assassins beyond the sea. On the eve of undertaking this foreign war for you, we do not consider it safe, either for you or for us, to leave other enemies behind to take advantage of our absence and watch for opportunities during the war; nor again do we think that there should be delay on their account, but that we ought rather to sweep them out of our pathway, once for all, seeing that they began the war against us when they voted us and the armies under us public enemies.
"What vast numbers of citizens have they, on their part, doomed to destruction with us, disregarding the vengeance of the gods and the reprobation of mankind! We shall not deal harshly with any multitude of men, nor shall we count as enemies all who have opposed us or plotted against us, or those distinguished for their riches merely, their abundance, or their high position; nor shall we slay as many as another man who held the supreme power before us, when he, too, was regulating the commonwealth in civil convulsions, and whom you named the Fortunate on account of his success; and yet necessarily three persons will have more enemies than one. We shall take vengeance only on the worst and most guilty. This we shall do for your interest no less than for our own, for while we keep up our conflicts you will all be involved necessarily in great dangers, and it is necessary for us also to do something to quiet the army, which has been insulted, irritated, and decreed a public enemy by our common foes. Although we might arrest on the spot whomsoever we had determined on, we prefer rather to proscribe rather than seize them unawares; and this, too, on your account, so that it may not be in the power of enraged soldiers to exceed their orders against persons not responsible, but that they may be restricted to a certain number designated by name, and spare the others according to order.
"So be it then! Let no one harbour any one of those whose names are hereto appended, or conceal them, or send them away, or be corrupted by their money. Whoever shall be detected in saving, or aiding, or conniving with them we will put on the list of the proscribed without allowing any excuse or pardon. Let those who kill the proscribed bring us their heads and receive the following rewards: to a free man 25,000 Attic drachmas per head; to a slave his freedom and 10,000 Attic drachmas and his master's right of citizenship. Informers shall receive the same rewards. In order that they may remain unknown the names of those who receive the rewards shall not be inscribed in our registers."