There are two aspects to this collection: firstly, the description of how communism initially fared across different European countries and secondly how the International sought to manage the various ideological splits within its movement.
If we start with the first of these, Marx was a strong supporter of Irish independence from Britain and the restoration of Polish sovereignty from Russia, Austria and Germany. His grounds for this are perhaps more questionable than the overall stance though: he felt that the likelihood of a revolution in Britain i.e. British workers would be forced to blame capitalism for their ills if their ability to scapegoat Irish workers as economic competitors was removed. In practice, there's no reason to think anything of the kind happened when Ireland did eventually gain its independence. Similarly, Marx saw Poland as potentially fertile territory for revolution but entirely missed the possibility that Russia was a more likely candidate.
The reason for this is that Marx saw revolution as the culmination of a historical process that was intrinsically tried to industrialisation. He plays down the possibility of revolution in Germany for similar reasons i.e. that the proportion of industrial workers versus agrarian workers was insufficient, as well as attributing the failure of the Paris Commune to the same cause: Paris itself had a sufficient proletariat but that failed outside of the city. It seems a naïve argument: industrial societies were comparatively prosperous to a society like Russia that only recently emancipated its serfs, so it hardly seems surprising that the conditions for revolution were greatest in poorer countries.
Moving onto the second point, Marx spends a great deal of time navigating between more meliorist tendencies that wanted social democratic reform (as with his critique of the Gotha programme) or more extreme figures like Bakunin. The former seems rather futile: in practice, social democratic reform of capitalist countries was a considerable success, even if Marx here denounces it as an impossibility. The latter is interesting, as he does seem to predict some aspects of the Soviet Union's ultimate failure: "if the workers replace the dictatorship of the bourgeois class with their own revolutionary dictatorship... a revolution is the authoritarian thing the is: it is the act whereby one part of the population imposes its will on the other part by means of rifles... the working class cannot simply lay hold of the readymade state machinery and wield it for its own purposes."