As Fragment 46 of the first book of Sallust's Histories Maurenbrecher prints: Magnis operibus perfectis obsidium cepit per L. Catilinam legatum. This he takes in effect to mean that Lucretius Ofella after the completion of great siege works received reinforcements brought by L. Catiline legate of Sulla. The interpretation depends largely upon his contention that the phrase obsidium cepit is to be taken as equivalent to subsidium cepit, for which he claims the authority, ultimately, of Verrius Flaccus as represented by Festus p. 193M s.v. obsidium. Though opinions may occasionally have differed as to the precise event documented by the fragment, this central assumption seems to have gone unchallenged by historians. Yet it rests upon remarkably insecure foundations. The reading cepit has scant authority and the interpretation of obsidium as subsidium (= auxilium) none at all. It is in fact the result of misunderstanding the passage of Festus in which the text is embedded.
In Lindsay's edition (p. 210) the Festus entry which is here quoted in full runs as follows:
Obsidium tamquam praesidium, subsidium recte dicitur, cuius etiam auctor C. Laelius pro se apud populum (i.e. Orat. 9): ‘Ut in nobis terra marique simul obsidium facerent.’ Et Sallustius historiarum I (46): ‘Magnis operibus perfectis obsidium coepit per L. Catilinam legatum.’
Coepit is the reading of the manuscript F, which has been generally accepted, while cepit appears only in the Aldine edition where it may well be an emendation or even an error, there being no obvious independent source which might have provided it. For Maurenbrecher it was merely the ‘correction’ of Corte (1724) who produced the earliest roughly chronological arrangement of the fragments of Sallust's Histories.