Translate: 'Hīs rēbus gestīs, Caesar, quod hostēs propinquābant, mīlitibus imperāvit ut celeriter iter facerent.'
Hint: Four constructions in one sentence: (1) hīs rēbus gestīs = ablative absolute; (2) quod + imperfect indicative = factual causal clause; (3) imperāvit + dative + ut + imperfect subjunctive = indirect command; (4) iter facerent = Caesarian march idiom.